var backgr1="fileadmin/hp/aerowatch/header/Header_04.jpg"
var backgr2="fileadmin/hp/aerowatch/header/Header_04.jpg"
var backgr3="fileadmin/hp/aerowatch/header/Header_04.jpg"

var cur=Math.round(6*Math.random())
if (cur<=1)
backgr=backgr1
else if (cur<=4)
backgr=backgr2
else
backgr=backgr3
document.write('<div align="center"><table background="'+backgr+'" border="0" class="header" cellpadding="0" cellspacing="0" width="770" height="142">')