// JavaScript Document
function openPopUp(url, windowName, w, h, scrollbar) {
           var winl = (screen.width - w) / 2;
           var wint = (screen.height - h) / 2;
           winprops = 'height='+h+',width='+w+',top='+wint+',left='+winl+',scrollbars='+scrollbar ;
		   win = window.open(url, windowName, winprops);
           if (parseInt(navigator.appVersion) >= 4) { 
              	win.window.focus(); 
           } 
}

function add_to_friend(){
	var url="http://viettechltd.com/support/chat.php?sid=1&a=99&id=615202632";
	openPopUp(url,"Add_To_Friends",450,200,"yes");
}