function getposOffset(overlay, offsettype){
var totaloffset=(offsettype=="left")? overlay.offsetLeft : overlay.offsetTop;
var parentEl=overlay.offsetParent;
while (parentEl!=null){
totaloffset=(offsettype=="left")? totaloffset+parentEl.offsetLeft : totaloffset+parentEl.offsetTop;
parentEl=parentEl.offsetParent;
}
return totaloffset;
}

function overlay(curobj, subobjstr, opt_position,left,top){
if (document.getElementById){
	
	if(subobjstr == "subcontent_login") {
		if(chkObject('subcontent')){
			if(document.getElementById('subcontent').style.display == "block") {
				document.getElementById('subcontent').style.display="none";
			}
		}
	} else {
		if(chkObject('subcontent_login')){
			if(document.getElementById('subcontent_login').style.display == "block") {
				document.getElementById('subcontent_login').style.display="none";
			}
		}		
	}
	
var subobj=document.getElementById(subobjstr)
subobj.style.display=(subobj.style.display!="block")? "block" : "none"
var xpos=getposOffset(curobj, "left")+((typeof opt_position!="undefined" && opt_position.indexOf("right")!=-1)? -(subobj.offsetWidth-curobj.offsetWidth) : 0) - left;
var ypos=getposOffset(curobj, "top")+((typeof opt_position!="undefined" && opt_position.indexOf("bottom")!=-1)? curobj.offsetHeight : 0) + top;
//alert(xpos + " : " + ypos);
subobj.style.left=xpos+"px"
subobj.style.top=ypos+"px"
return false
}
else
return true
}

function overlayclose(subobj){
document.getElementById(subobj).style.display="none"
}

function chkObject(theVal) {
		if (document.getElementById(theVal) != null) {
			return true;
		} else {
			return false;
		}
}