function openwin(url,w,h,name,bar){
    var t=(screen.height/2)-(h/2);
    var l=(screen.width/2)-(w/2);
    var features='height='+h+',width='+w+',top='+t+',left='+l+',resizable=no,titlebar=no,scrollbars='+bar;
    win = window.open(url,name,features);
	return false;
}