function pickThumb(displayNumber)
{

totalPics=34


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


if (picNum==1) picDescr="http://www.datacomm.ch/shadowfax/tram/photo/zurich/2lsb_eschwyss"
if (picNum==1) linkDescr[displayNumber]="http://www.proaktiva.ch/tram/photo/zurich/2lsb_eschwyss_c.html"
if (picNum==2) picDescr="http://www.proaktiva.ch/rail/polybahn/96062902"
if (picNum==2) linkDescr[displayNumber]="http://www.proaktiva.ch/tram/photo/zurich/tram_polybahn_c.html"
if (picNum==3) picDescr="http://www.datacomm.ch/shadowfax/tram/photo/zurich/bhfwiedikon980322b"
if (picNum==3) linkDescr[displayNumber]="http://www.proaktiva.ch/tram/photo/zurich/bhfwiedikon980322b_c.html"
if (picNum==4) picDescr="http://www.datacomm.ch/shadowfax/tram/photo/zurich/bhfwiedikon980322a"
if (picNum==4) linkDescr[displayNumber]="http://www.proaktiva.ch/tram/photo/zurich/bhfwiedikon980322a_c.html"
if (picNum==5) picDescr="http://www.datacomm.ch/shadowfax/tram/photo/zurich/1419central990208"
if (picNum==5) linkDescr[displayNumber]="http://www.proaktiva.ch/tram/photo/zurich/1419central990208_c.html"
if (picNum==6) picDescr="http://www.datacomm.ch/shadowfax/tram/photo/zurich/2086bhfstr9902082"
if (picNum==6) linkDescr[displayNumber]="http://www.proaktiva.ch/tram/photo/zurich/2086bhfstr9902082_c.html"
if (picNum==7) picDescr="http://www.datacomm.ch/shadowfax/tram/photo/zurich/2086bhfstr9902081"
if (picNum==7) linkDescr[displayNumber]="http://www.proaktiva.ch/tram/photo/zurich/2086bhfstr9902081_c.html"
if (picNum==8) picDescr="http://www.datacomm.ch/shadowfax/tram/photo/zurich/bhfstr990208"
if (picNum==8) linkDescr[displayNumber]="http://www.proaktiva.ch/tram/photo/zurich/bhfstr990208_c.html"
if (picNum==9) picDescr="http://www.datacomm.ch/shadowfax/tram/photo/zurich/2041bhfstr990208"
if (picNum==9) linkDescr[displayNumber]="http://www.proaktiva.ch/tram/photo/zurich/2041bhfstr990208_c.html"
if (picNum==10) picDescr="http://www.datacomm.ch/shadowfax/tram/photo/zurich/2113oerlikon010825a"
if (picNum==10) linkDescr[displayNumber]="http://www.proaktiva.ch/tram/photo/zurich/2113oerlikon010825a_c.html"
if (picNum==11) picDescr="http://www.datacomm.ch/shadowfax/tram/photo/zurich/lsb010600"
if (picNum==11) linkDescr[displayNumber]="http://www.proaktiva.ch/tram/photo/zurich/lsb010600_c.html"
if (picNum==12) picDescr="http://www.datacomm.ch/shadowfax/tram/photo/zurich/lsb010601"
if (picNum==12) linkDescr[displayNumber]="http://www.proaktiva.ch/tram/photo/zurich/lsb010601_c.html"
if (picNum==13) picDescr="http://www.datacomm.ch/shadowfax/tram/photo/zurich/lsbwartau1a"
if (picNum==13) linkDescr[displayNumber]="http://www.proaktiva.ch/tram/photo/zurich/lsbwartau1a_c.html"
if (picNum==14) picDescr="http://www.datacomm.ch/shadowfax/tram/photo/zurich/lsbwartau1b"
if (picNum==14) linkDescr[displayNumber]="http://www.proaktiva.ch/tram/photo/zurich/lsbwartau1b_c.html"
if (picNum==15) picDescr="http://www.datacomm.ch/shadowfax/tram/photo/zurich/milchbuck1"
if (picNum==15) linkDescr[displayNumber]="http://www.proaktiva.ch/tram/photo/zurich/milchbuck1_c.html"
if (picNum==16) picDescr="http://www.datacomm.ch/shadowfax/tram/photo/zurich/1995jan00"
if (picNum==16) linkDescr[displayNumber]="http://www.proaktiva.ch/tram/photo/zurich/1995jan00_c.html"
if (picNum==17) picDescr="http://www.datacomm.ch/shadowfax/tram/photo/zurich/1995jan01"
if (picNum==17) linkDescr[displayNumber]="http://www.proaktiva.ch/tram/photo/zurich/1995jan01_c.html"
if (picNum==18) picDescr="http://www.datacomm.ch/shadowfax/tram/photo/zurich/1995may00"
if (picNum==18) linkDescr[displayNumber]="http://www.proaktiva.ch/tram/photo/zurich/1995may00_c.html"
if (picNum==19) picDescr="http://www.datacomm.ch/shadowfax/tram/photo/zurich/1994102500"
if (picNum==19) linkDescr[displayNumber]="http://www.proaktiva.ch/tram/photo/zurich/1994102500_c.html"
if (picNum==20) picDescr="http://www.datacomm.ch/shadowfax/tram/photo/zurich/1994102501"
if (picNum==20) linkDescr[displayNumber]="http://www.proaktiva.ch/tram/photo/zurich/1994102501_c.html"
if (picNum==21) picDescr="http://www.datacomm.ch/shadowfax/tram/photo/zurich/1995080500"
if (picNum==21) linkDescr[displayNumber]="http://www.proaktiva.ch/tram/photo/zurich/1995080500_c.html"
if (picNum==22) linkDescr[displayNumber]="http://www.proaktiva.ch/tram/photo/zurich/1995jan02"
if (picNum==22) linkDescr[displayNumber]="http://www.proaktiva.ch/tram/photo/zurich/1995jan02_c.html"
if (picNum==23) picDescr="http://www.datacomm.ch/shadowfax/tram/photo/zurich/2002031600"
if (picNum==23) linkDescr[displayNumber]="http://www.proaktiva.ch/tram/photo/zurich/2002031600_c.html"
if (picNum==24) picDescr="http://www.datacomm.ch/shadowfax/tram/photo/zurich/2002031601"
if (picNum==24) linkDescr[displayNumber]="http://www.proaktiva.ch/tram/photo/zurich/2002031601_c.html"
if (picNum==25) picDescr="http://www.datacomm.ch/shadowfax/tram/photo/zurich/1994070300"
if (picNum==25) linkDescr[displayNumber]="http://www.proaktiva.ch/tram/photo/zurich/1994070300_c.html"
if (picNum==26) picDescr="http://www.datacomm.ch/shadowfax/tram/photo/zurich/1994072600"
if (picNum==26) linkDescr[displayNumber]="http://www.proaktiva.ch/tram/photo/zurich/1994072600_c.html"
if (picNum==27) picDescr="http://www.proaktiva.ch/tram/photo/zurich/2113oerlikon010825c"
if (picNum==28) picDescr="http://www.datacomm.ch/shadowfax/tram/photo/zurich/9602_1422"
if (picNum==28) linkDescr[displayNumber]="http://www.proaktiva.ch/tram/photo/zurich/9602_1422_c.html"
if (picNum==29) picDescr="http://www.datacomm.ch/shadowfax/tram/photo/zurich/9602_1427"
if (picNum==29) linkDescr[displayNumber]="http://www.proaktiva.ch/tram/photo/zurich/9602_1427_c.html"
if (picNum==30) picDescr="http://www.datacomm.ch/shadowfax/tram/photo/zurich/95_102gess"
if (picNum==30) linkDescr[displayNumber]="http://www.proaktiva.ch/tram/photo/zurich/95_102gess_c.html"
if (picNum==31) picDescr="http://www.datacomm.ch/shadowfax/tram/photo/zurich/95_bhfoer"
if (picNum==31) linkDescr[displayNumber]="http://www.proaktiva.ch/tram/photo/zurich/95_bhfoer_c.html"
if (picNum==32) picDescr="http://www.datacomm.ch/shadowfax/tram/photo/zurich/950808_1952a"
if (picNum==32) linkDescr[displayNumber]="http://www.proaktiva.ch/tram/photo/zurich/950808_1952a_c.html"
if (picNum==33) picDescr="http://www.datacomm.ch/shadowfax/tram/photo/zurich/950808_1952b"
if (picNum==33) linkDescr[displayNumber]="http://www.proaktiva.ch/tram/photo/zurich/950808_1952b_c.html"
if (picNum==34) picDescr="http://www.datacomm.ch/shadowfax/tram/photo/zurich/950808_depoer"
if (picNum==34) linkDescr[displayNumber]="http://www.proaktiva.ch/tram/photo/zurich/950808_depoer_c.html"

}