/*function setVariables() {
if (navigator.appName == "Netscape") {
v=".top=";
dS="document.";
sD="";
y="window.pageYOffset";
}
else {
v=".pixelTop=";
dS="";
sD=".style";
y="document.body.scrollTop";
   }
}
function checkLocation() {
object="getElementById('object1')";
yy=eval(y);
eval(dS+object+sD+v+yy);
setTimeout("checkLocation()",10);
}*/

var MenuTopMin;

window.onload = function(){
	MenuTopMin = $('div_menu').offsetTop;	
}

setInterval("VerificaScroll()",100);

function VerificaScroll(){	
	if(document.documentElement && document.documentElement.scrollTop)
		var ScrollTop = document.documentElement.scrollTop
	else if(document.body && document.body.scrollTop)
		var ScrollTop = document.body.scrollTop;
	else if(window.pageYOffset)
		var ScrollTop = window.pageYOffset;	
			
	if(parseInt(ScrollTop) > MenuTopMin)
		$('div_menu').style.top = ((ScrollTop-MenuTopMin)+20)+'px';
	else
		$('div_menu').style.top = '0px';
}