function initPage()
{
var navRoot = document.getElementById("header");
var uls = navRoot.getElementsByTagName("ul");
for (var i=0; i<uls.length; i++)
{
lis = uls[i].getElementsByTagName("li");
for (var j=0; j<lis.length; j++) {
lis[j].onmouseover = function()
{
this.className += " hover";
}
lis[j].onmouseout = function()
{
this.className = this.className.replace(new RegExp("hover"),"");
}
}
}

}
if (window.attachEvent && !window.opera)
attachEvent("onload", initPage);