function show_layer(url, var1, var2, y, w, h) {
	var objBody = document.getElementsByTagName("body").item(0);
	var objOverlay = document.createElement("div");
	
	objOverlay.setAttribute('id','overlay_2');
	objOverlay.setAttribute('onclick','hide_layer()');
	objOverlay.style.position = 'absolute';
	objOverlay.style.top = '0px';
	objOverlay.style.left = '0px';
	objOverlay.style.zIndex = '90';
 	objOverlay.style.width = '100%';
	/*objOverlay.style.height = '100%';*/
	objOverlay.style.height = objBody.offsetHeight+'px';
	objOverlay.innerHTML = '<table width="'+w+'" style="margin-top:'+y+'px; background-color:#FFFFFF;" align="center"><tr><td><iframe src="iframe_'+url+'.php?var1='+var1+'&var2='+var2+'" width="'+w+'" height="'+h+'" frameborder="0" scrolling="no" allowtransparency="true"></iframe></td></tr></table>';
	objBody.insertBefore(objOverlay, objBody.firstChild);
}

function hide_layer() {
	document.getElementById('overlay_2').innerHTML = '';
	document.getElementById('overlay_2').style.display = 'none';
}

var win = null;
function NewWindow(mypage,myname,w,h,scrollbars){
LeftPosition = (screen.width) ? (screen.width-w)/2 : 0;
TopPosition = (screen.height) ? (screen.height-h)/2 : 0;
settings =
'height='+h+',width='+w+',top='+TopPosition+',left='+LeftPosition+',scrollbars='+scrollbars+',resizable=no'
win = window.open(mypage,myname,settings)
}