function winopen(url,w,h) {
var width_X;
width_X = (window.screen.width/2) - (w/2+10);
var height_Y;
height_Y = (window.screen.height/2) - (h/2+25);
win = window.open(url,name,'scrollbars=yes,toolbar=no,menubar=no,status=no,width='+w+',height='+h+',top='+height_Y+',left='+width_X+',resizable=no,location=no');
return (typeof(win)=='object') ? false : true;
}