function popup(URL)
{
var iWidth = 550;
var iHeight = 500;
var iLeft=window.screen.width/2 - iWidth/2;
var iTop=window.screen.height/2 - iHeight/2 - 25;
popupWindow=window.open(URL,"_blank",'toolbar=0,location=0,directories=0,status=0,menubar=0,scrollbars=1,resizable=0,width=' + iWidth + ',height=' + iHeight + ',screenX=' + iLeft + ',screenY=' + iTop + ',left=' + iLeft + ',top=' + iTop);
}