function Open(url,width,height) {
        LeftPosition = (screen.width) ? (screen.width-width)/2 : 0;
        TopPosition = (screen.height) ? (screen.height-height)/2 : 0;
        OpenWin = this.open(url,"PicWindow","toolbar=no,width="+width+",height="+height+",left="+LeftPosition+",top="+TopPosition+",directories=no,status=no,scrollbars=no,resize=no,menubar=no")
}