function popUp(URL, pwidth, pheight) {

if(pwidth == undefined){
	pwidth = '800';	
}

if(pheight == undefined){
	pheight = '600';	
}


var screenwidth = screen.width / 2;
var screenheight = screen.height / 2;

var posoffsetX = pwidth / 2;
var posoffsetY = pheight / 2;

var newPosX = screenwidth - posoffsetX;
var newPosY = screenheight - posoffsetY;
var newPosY = newPosY - 100;




day = new Date();
id = day.getTime();
eval("page" + id + " = window.open(URL, '" + id + "', 'toolbar=0,scrollbars=0,location=0,statusbar=0,menubar=0,resizable=0,width='+pwidth+',height='+pheight+',left = '+newPosX+',top = '+newPosY+'');");
}