function openWindow(page, width, height, url) {
	//var width = 500;
	//var height = 400;
	//var page = "/sends/send_to_a_friend/";
	
    x = (640 - width)/2, y = (480 - height)/2;

    if (screen) {
        y = (screen.availHeight - height)/2;
        x = (screen.availWidth - width)/2;
    }
    window.open(page+'?page='+url,'newWin','width='+width+',height='+height+',screenX='+x+',screenY='+y+',top='+y+',left='+x+',scrollbars=no');
}