function Overlay()
{
	this.id="overlay";
	this.obj;
	this.show=function()
	{
		if(!document.getElementById(this.id)){this.obj=createObject(this.id,"div");}
		else{this.obj=document.getElementById("overlay");}
		this.obj.onclick = closeDiv;
		this.obj.style.display="block";
		setBrauser();
		var Scroll=getBodyScrollTop();
		this.obj.style.height=screenHeight+Scroll+"px";
		//this.obj.onclick=function(){alert('ok');}
		//alert('show');
		globalBody.appendChild(this.obj);
	}
	this.hide=function()
	{
		if(!document.getElementById(this.id)){return false;}
		this.obj=document.getElementById("overlay");
		globalBody.removeChild(this.obj);
	}
	function getBodyScrollTop()
	{
		  return self.pageYOffset || (document.documentElement && document.documentElement.scrollTop) || (document.body && document.body.scrollTop);
	}
}