function pickThumb(displayNumber)
{

totalPics=105


picNum=Math.ceil(Math.random()*totalPics)


if (picNum==1) picDescr="http://www.proaktiva.ch/tram/photo/freiburg/110wonnhalde"
if (picNum==2) picDescr="http://www.proaktiva.ch/tram/photo/freiburg/154stadthalle"
if (picNum==3) picDescr="http://www.proaktiva.ch/tram/photo/freiburg/221runzmatten"
if (picNum==4) picDescr="http://www.proaktiva.ch/tram/photo/madrid/in1"
if (picNum==4) linkDescr[displayNumber]="madrid/in1_2_3_c.html?a"
if (picNum==5) picDescr="http://www.proaktiva.ch/tram/photo/madrid/in2"
if (picNum==5) linkDescr[displayNumber]="madrid/in1_2_3_c.html?b"
if (picNum==6) picDescr="http://www.proaktiva.ch/tram/photo/freiburg/cutting3"
if (picNum==7) picDescr="http://www.proaktiva.ch/tram/photo/freiburg/251lindenwaeldle"
if (picNum==8) picDescr="http://www.proaktiva.ch/tram/photo/stuttgart/wilhelmsplatz1"
if (picNum==9) picDescr="http://www.proaktiva.ch/tram/photo/stuttgart/wilhelmsplatz2"
if (picNum==10) picDescr="http://www.proaktiva.ch/tram/photo/freiburg/253bertoldstr"
if (picNum==11) picDescr="http://www.proaktiva.ch/tram/photo/freiburg/273hbf"
if (picNum==12) picDescr="http://www.proaktiva.ch/tram/photo/paysandu/ht"
if (picNum==13) picDescr="http://www.proaktiva.ch/tram/photo/montevideo/k1"
if (picNum==14) picDescr="http://www.proaktiva.ch/tram/photo/montevideo/k2"
if (picNum==15) picDescr="http://www.proaktiva.ch/tram/photo/freiburg/249bertoldstr"
if (picNum==16) picDescr="http://www.proaktiva.ch/tram/photo/freiburg/254bertoldstr"
if (picNum==17) picDescr="http://www.proaktiva.ch/tram/photo/freiburg/109reutebach"
if (picNum==18) picDescr="http://www.proaktiva.ch/tram/photo/freiburg/206komturpl"
if (picNum==19) picDescr="http://www.proaktiva.ch/tram/photo/freiburg/250komturpl"
if (picNum==20) picDescr="http://www.proaktiva.ch/tram/photo/freiburg/256stadtbahn"
if (picNum==21) picDescr="http://www.proaktiva.ch/tram/photo/freiburg/2depot"
if (picNum==22) picDescr="http://www.proaktiva.ch/tram/photo/freiburg/56dorfstr"
if (picNum==23) picDescr="http://www.proaktiva.ch/tram/photo/freiburg/56guenterstal"
if (picNum==24) picDescr="http://www.proaktiva.ch/tram/photo/freiburg/depot1"
if (picNum==25) picDescr="http://www.datacomm.ch/shadowfax/tram/photo/zurich/2lsb_eschwyss"
if (picNum==25) linkDescr[displayNumber]="http://www.proaktiva.ch/tram/photo/zurich/2lsb_eschwyss_c.html"
if (picNum==26) picDescr="http://www.proaktiva.ch/tram/photo/eatm/blackpool159"
if (picNum==27) picDescr="http://www.proaktiva.ch/tram/photo/alessandria/f1"
if (picNum==28) picDescr="http://www.proaktiva.ch/tram/photo/alessandria/f2"
if (picNum==29) picDescr="http://www.proaktiva.ch/tram/photo/alessandria/f3"
if (picNum==30) picDescr="http://www.proaktiva.ch/tram/photo/alessandria/f4"
if (picNum==31) picDescr="http://www.proaktiva.ch/tram/photo/alessandria/f5"
if (picNum==32) picDescr="http://www.proaktiva.ch/tram/photo/alessandria/f6"
if (picNum==33) picDescr="http://www.proaktiva.ch/rail/polybahn/96062902"
if (picNum==34) picDescr="http://www.proaktiva.ch/tram/photo/madrid/mad4"
if (picNum==35) picDescr="http://www.proaktiva.ch/tram/photo/madrid/mad7"
if (picNum==36) picDescr="http://www.proaktiva.ch/tram/photo/madrid/pza_mayor"
if (picNum==37) picDescr="http://www.proaktiva.ch/tram/photo/praha/oldpraga1"
if (picNum==38) picDescr="http://www.proaktiva.ch/tram/photo/praha/oldpraga3"
if (picNum==39) picDescr="http://www.proaktiva.ch/tram/photo/praha/praga2"
if (picNum==40) picDescr="http://www.proaktiva.ch/tram/photo/lyon/lyonJM1"
if (picNum==41) picDescr="http://www.proaktiva.ch/tram/photo/lyon/lyonPA1"
if (picNum==42) picDescr="http://www.proaktiva.ch/tram/photo/lyon/lyonPA2"
if (picNum==43) picDescr="http://www.proaktiva.ch/tram/photo/lyon/lyonPA4"
if (picNum==44) picDescr="http://www.proaktiva.ch/tram/photo/lyon/lyonPD1"
if (picNum==45) picDescr="http://www.proaktiva.ch/tram/photo/lyon/lyonPD2"
if (picNum==46) picDescr="http://www.datacomm.ch/shadowfax/tram/photo/zurich/bhfwiedikon980322b"
if (picNum==46) linkDescr[displayNumber]="http://www.proaktiva.ch/tram/photo/zurich/bhfwiedikon980322b_c.html"
if (picNum==47) picDescr="http://www.datacomm.ch/shadowfax/tram/photo/zurich/bhfwiedikon980322a"
if (picNum==47) linkDescr[displayNumber]="http://www.proaktiva.ch/tram/photo/zurich/bhfwiedikon980322a_c.html"
if (picNum==48) picDescr="http://www.datacomm.ch/shadowfax/tram/photo/zurich/1419central990208"
if (picNum==48) linkDescr[displayNumber]="http://www.proaktiva.ch/tram/photo/zurich/1419central990208_c.html"
if (picNum==49) picDescr="http://www.datacomm.ch/shadowfax/tram/photo/zurich/2086bhfstr9902082"
if (picNum==49) linkDescr[displayNumber]="http://www.proaktiva.ch/tram/photo/zurich/2086bhfstr9902082_c.html"
if (picNum==50) picDescr="http://www.datacomm.ch/shadowfax/tram/photo/zurich/2086bhfstr9902081"
if (picNum==50) linkDescr[displayNumber]="http://www.proaktiva.ch/tram/photo/zurich/2086bhfstr9902081_c.html"
if (picNum==51) picDescr="http://www.datacomm.ch/shadowfax/tram/photo/zurich/bhfstr990208"
if (picNum==51) linkDescr[displayNumber]="http://www.proaktiva.ch/tram/photo/zurich/bhfstr990208_c.html"
if (picNum==52) picDescr="http://www.datacomm.ch/shadowfax/tram/photo/zurich/2041bhfstr990208"
if (picNum==52) linkDescr[displayNumber]="http://www.proaktiva.ch/tram/photo/photo/zurich/2041bhfstr990208_c.html"
if (picNum==53) picDescr="http://www.datacomm.ch/shadowfax/tram/photo/zurich/2113oerlikon010825a"
if (picNum==53) linkDescr[displayNumber]="http://www.proaktiva.ch/tram/photo/zurich/2113oerlikon010825a_c.html"
if (picNum==54) picDescr="http://www.datacomm.ch/shadowfax/tram/photo/zurich/lsb010600"
if (picNum==54) linkDescr[displayNumber]="http://www.proaktiva.ch/tram/photo/zurich/lsb010600_c.html"
if (picNum==55) picDescr="http://www.datacomm.ch/shadowfax/tram/photo/zurich/lsb010601"
if (picNum==55) linkDescr[displayNumber]="http://www.proaktiva.ch/tram/photo/zurich/lsb010601_c.html"
if (picNum==56) picDescr="http://www.datacomm.ch/shadowfax/tram/photo/zurich/lsbwartau1a"
if (picNum==56) linkDescr[displayNumber]="http://www.proaktiva.ch/tram/photo/zurich/lsbwartau1a.html"
if (picNum==57) picDescr="http://www.datacomm.ch/shadowfax/tram/photo/zurich/lsbwartau1b"
if (picNum==57) linkDescr[displayNumber]="http://www.proaktiva.ch/tram/photo/zurich/lsbwartau1b.html"
if (picNum==58) picDescr="http://www.proaktiva.ch/tram/photo/barcelona/tibidabo9907"
if (picNum==59) picDescr="http://www.proaktiva.ch/tram/photo/freiburg/231oberlin99"
if (picNum==60) picDescr="http://www.proaktiva.ch/rail/swiss_ng/saentisHerisau"
if (picNum==61) picDescr="http://www.datacomm.ch/shadowfax/tram/photo/magdeburg/030732831k"
if (picNum==61) linkDescr[displayNumber]="http://www.proaktiva.ch/tram/photo/magdeburg/030732831k_c.html"
if (picNum==62) picDescr="http://www.datacomm.ch/shadowfax/tram/photo/magdeburg/030732844k"
if (picNum==62) linkDescr[displayNumber]="http://www.proaktiva.ch/tram/photo/magdeburg/030732844k_c.html"
if (picNum==63) picDescr="http://www.datacomm.ch/shadowfax/tram/photo/magdeburg/030732846k"
if (picNum==63) linkDescr[displayNumber]="http://www.proaktiva.ch/tram/photo/magdeburg/030732846k_c.html"
if (picNum==64) picDescr="http://www.datacomm.ch/shadowfax/tram/photo/magdeburg/030732848k"
if (picNum==64) linkDescr[displayNumber]="http://www.proaktiva.ch/tram/photo/magdeburg/030732848k_c.html"
if (picNum==65) picDescr="http://www.datacomm.ch/shadowfax/tram/photo/magdeburg/030732851k"
if (picNum==65) linkDescr[displayNumber]="http://www.proaktiva.ch/tram/photo/magdeburg/030732851k_c.html"
if (picNum==66) picDescr="http://www.datacomm.ch/shadowfax/tram/photo/magdeburg/030732852k"
if (picNum==66) linkDescr[displayNumber]="http://www.proaktiva.ch/tram/photo/magdeburg/030732852k_c.html"
if (picNum==67) picDescr="http://www.datacomm.ch/shadowfax/tram/photo/magdeburg/magd100_1"
if (picNum==67) linkDescr[displayNumber]="http://www.proaktiva.ch/tram/photo/magdeburg/magd100_1_c.html"
if (picNum==68) picDescr="http://www.datacomm.ch/shadowfax/tram/photo/magdeburg/magd100_2"
if (picNum==68) linkDescr[displayNumber]="http://www.proaktiva.ch/tram/photo/magdeburg/magd100_2_c.html"
if (picNum==69) picDescr="http://www.datacomm.ch/shadowfax/tram/photo/magdeburg/030732841k"
if (picNum==69) linkDescr[displayNumber]="http://www.proaktiva.ch/tram/photo/magdeburg/030732841k_c.html"
if (picNum==70) picDescr="http://www.datacomm.ch/shadowfax/tram/photo/zurich/milchbuck1"
if (picNum==70) linkDescr[displayNumber]="http://www.proaktiva.ch/tram/photo/zurich/milchbuck1_c.html"
if (picNum==71) picDescr="http://www.proaktiva.ch/tram/photo/freiburg/1995apr00"
if (picNum==72) picDescr="http://www.proaktiva.ch/tram/photo/freiburg/1995apr01"
if (picNum==73) picDescr="http://www.proaktiva.ch/tram/photo/freiburg/1995apr02"
if (picNum==74) picDescr="http://www.proaktiva.ch/tram/photo/freiburg/1995apr03"
if (picNum==75) picDescr="http://www.proaktiva.ch/tram/photo/freiburg/1995apr04"
if (picNum==76) picDescr="http://www.proaktiva.ch/tram/photo/freiburg/1995aug00"
if (picNum==77) picDescr="http://www.datacomm.ch/shadowfax/tram/photo/zurich/1995jan00"
if (picNum==77) linkDescr[displayNumber]="http://www.proaktiva.ch/tram/photo/zurich/1995jan00_c.html"
if (picNum==78) picDescr="http://www.datacomm.ch/shadowfax/tram/photo/zurich/1995jan01"
if (picNum==78) linkDescr[displayNumber]="http://www.proaktiva.ch/tram/photo/zurich/1995jan01_c.html"
if (picNum==79) picDescr="http://www.datacomm.ch/shadowfax/tram/photo/zurich/1995may00"
if (picNum==79) linkDescr[displayNumber]="http://www.proaktiva.ch/tram/photo/zurich/1995may00_c.html"
if (picNum==80) picDescr="http://www.datacomm.ch/shadowfax/tram/photo/zurich/1994102500"
if (picNum==80) linkDescr[displayNumber]="http://www.proaktiva.ch/tram/photo/zurich/1994102500_c.html"
if (picNum==81) picDescr="http://www.datacomm.ch/shadowfax/tram/photo/zurich/1994102501"
if (picNum==81) linkDescr[displayNumber]="http://www.proaktiva.ch/tram/photo/zurich/1994102501_c.html"
if (picNum==82) picDescr="http://www.datacomm.ch/shadowfax/tram/photo/zurich/1995080500"
if (picNum==82) linkDescr[displayNumber]="http://www.proaktiva.ch/tram/photo/zurich/1995080500_c.html"
if (picNum==83) linkDescr[displayNumber]="http://www.proaktiva.ch/tram/photo/zurich/1995jan02"
if (picNum==83) linkDescr[displayNumber]="http://www.proaktiva.ch/tram/photo/zurich/1995jan02_c.html"
if (picNum==84) picDescr="http://www.datacomm.ch/shadowfax/tram/photo/zurich/2002031600"
if (picNum==84) linkDescr[displayNumber]="http://www.proaktiva.ch/tram/photo/zurich/2002031600_c.html"
if (picNum==85) picDescr="http://www.datacomm.ch/shadowfax/tram/photo/zurich/2002031601"
if (picNum==85) linkDescr[displayNumber]="http://www.proaktiva.ch/tram/photo/zurich/2002031601_c.html"
if (picNum==86) picDescr="http://www.datacomm.ch/shadowfax/tram/photo/zurich/1994070300"
if (picNum==86) linkDescr[displayNumber]="http://www.proaktiva.ch/tram/photo/zurich/1994070300_c.html"
if (picNum==87) picDescr="http://www.datacomm.ch/shadowfax/tram/photo/zurich/1994072600"
if (picNum==87) linkDescr[displayNumber]="http://www.proaktiva.ch/tram/photo/zurich/1994072600_c.html"
if (picNum==88) picDescr="http://www.proaktiva.ch/tram/photo/freiburg/20020928freiburg45"
if (picNum==89) picDescr="http://www.proaktiva.ch/tram/photo/freiburg/20020928freiburg224"
if (picNum==90) picDescr="http://www.proaktiva.ch/tram/photo/freiburg/20020928freiburg227"
if (picNum==91) picDescr="http://www.proaktiva.ch/tram/photo/freiburg/20020928freiburg241"
if (picNum==92) picDescr="http://www.proaktiva.ch/tram/photo/freiburg/20020928freiburg254"
if (picNum==93) picDescr="http://www.proaktiva.ch/tram/photo/freiburg/20020928freiburg255"
if (picNum==94) picDescr="http://www.datacomm.ch/shadowfax/tram/photo/zurich/20020928zurich2086"
if (picNum==94) 
linkDescr[displayNumber]="http://www.proaktiva.ch/tram/photo/zurich/20020928zurich2086"
if (picNum==95) picDescr="http://www.proaktiva.ch/tram/photo/zurich/2113oerlikon010825c"
if (picNum==96) picDescr="http://www.datacomm.ch/shadowfax/tram/photo/zurich/9602_1422"
if (picNum==96) linkDescr[displayNumber]="http://www.proaktiva.ch/tram/photo/zurich/9602_1422_c.html"
if (picNum==97) picDescr="http://www.datacomm.ch/shadowfax/tram/photo/zurich/9602_1427"
if (picNum==97) linkDescr[displayNumber]="http://www.proaktiva.ch/tram/photo/zurich/9602_1427_c.html"
if (picNum==98) picDescr="http://www.datacomm.ch/shadowfax/tram/photo/zurich/95_102gess"
if (picNum==98) linkDescr[displayNumber]="http://www.proaktiva.ch/tram/photo/zurich/95_102gess_c.html"
if (picNum==99) picDescr="http://www.datacomm.ch/shadowfax/tram/photo/zurich/95_bhfoer"
if (picNum==99) linkDescr[displayNumber]="http://www.proaktiva.ch/tram/photo/zurich/95_bhfoer_c.html"
if (picNum==100) picDescr="http://www.datacomm.ch/shadowfax/tram/photo/zurich/950808_1952a"
if (picNum==100) linkDescr[displayNumber]="http://www.proaktiva.ch/tram/photo/zurich/950808_1952a_c.html"
if (picNum==101) picDescr="http://www.datacomm.ch/shadowfax/tram/photo/zurich/950808_1952b"
if (picNum==101) linkDescr[displayNumber]="http://www.proaktiva.ch/tram/photo/zurich/950808_1952b_c.html"
if (picNum==102) picDescr="http://www.datacomm.ch/shadowfax/tram/photo/zurich/950808_depoer"
if (picNum==102) linkDescr[displayNumber]="http://www.proaktiva.ch/tram/photo/zurich/950808_depoer_c.html"
if (picNum==103) picDescr="http://www.proaktiva.ch/tram/photo/porto/MP03CM02-07-06"
if (picNum==104) picDescr="http://www.proaktiva.ch/tram/photo/porto/MP04CM02-07-06"
if (picNum==105) picDescr="http://www.proaktiva.ch/tram/photo/porto/MP05CM02-07-06"
}