var backgr1="navbkg1"
var backgr2="navbkg2"
var backgr3="navbkg3"
var backgr4="navbkg4"
var backgr5="navbkg5"
var backgr6="navbkg6"
 
var cur=Math.round(7*Math.random())
if (cur<=1)
backgr=backgr1
else if (cur<=2)
backgr=backgr2
else if (cur<=3)
backgr=backgr3
else if (cur<=4)
backgr=backgr4
else if (cur<=5)
backgr=backgr5
else 
backgr=backgr6

document.write('<td height="178" valign="top" class="'+backgr+'">')