function referAFriend(URL){	
    var browser = navigator.appName;
    var width = 400;
   	var height = 470;
    swidth = ((screen.width/2)-(width/2));
    sheight = ((screen.height/2)-(height/2));
	newWin = window.open(URL,'referafriend','width='+ width +',height='+ height +',screenY='+ sheight +',screenX='+ swidth +',top=' + sheight + ',left=' + swidth + ',resizeable=no,scrollbars=no');
    newWin.focus();
	}