function openWindow(theURL,winName,winWidth,winHeight) {
    var popup_width=winWidth;
    var popup_height=winHeight;
    var screen_width=window.screen.width;
    var screen_height=window.screen.height-36;
    var popup_left=Math.round((screen_width-popup_width)/2);
    var popup_top=Math.round((screen_height-popup_height)/2);  
	
	popupwindow=window.open(theURL,winName,"height="+winHeight+",width="+popup_width+",left="+popup_left+",top="+popup_top+",scrollbars=auto,toolbar=no,location=no,status=yes,menubar=no,resizable=yes");
}