function openwindow(h,w,url)
{
	l = (screen.availWidth/2)-(w/2);
	t = (screen.availHeight/2)-(h/2);
	win = window.open(url,"Edit","resizable=yes,scrollbars=yes,width="+w+",height="+h+",left="+l+",top="+t+"");
	win.focus();
}