// JavaScript Document
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){
	if(curobj.checked==true){
		if (document.getElementById){
			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) ;
			var ypos=getposOffset(curobj, "top")+((typeof opt_position!="undefined" && opt_position.indexOf("bottom")!=-1)? curobj.offsetHeight : 0);
			subobj.style.left=xpos+"px";
			subobj.style.top=ypos+"px";
		}
		else
			return true;
	}
	else
		overlayclose(subobjstr);
}

function overlayclose(subobj){
	document.getElementById(subobj).style.display="none";
}
function overlaycloseuncheck(subobj, checkboxobj){
	document.getElementById(subobj).style.display = "none";
	document.getElementById(checkboxobj).checked = false;
}