function changebg()
{
var setbg=document.getElementById("setbg")
setbg.style.cssText="width: 278px; height: 170px;margin-left:6px!important;margin-left:3px; background:url(images/p1.jpg); float:left;"
}
function changebg1()
{
var setbg=document.getElementById("setbg")
setbg.style.cssText=" width: 278px; height: 170px;margin-left:6px!important;margin-left:3px;background:url(images/p2.jpg); float:left;"
}
function changebg2()
{
var setbg=document.getElementById("setbg")
setbg.style.cssText=" width: 278px; height: 170px;margin-left:6px!important;margin-left:3px;background:url(images/p3.jpg); float:left;"
}