var newWindow=null;
function MM_openBrWindow(theURL,winName,width,height,scrollbars) { //v2.0
	 if(newWindow!=null){
	 newWindow.close();
	 newWindow=window.open(theURL,winName,width,height,scrollbars);}
	 else 
	 newWindow=window.open(theURL,winName,width,height,scrollbars);
}