var temp;
function openpopup (myfile, myname, breite, hoehe)
{
	if((navigator.appName.indexOf("Explorer")!=-1)&&(parseInt(navigator.appVersion.substring(0,1))<4))
		{
		params = "width=" + breite + ",height=" + hoehe + ",resizable=0,status=0,scrollbars=0,toolbar=0,location=0,directories=0,menubar=0";
    	newwin = window.open( myfile , myname , params)	;
		}
	else
		{
			if(temp)
			{
				if(!temp.closed)
					{
					temp.close();temp="";
					}
			}
		
    	params = "width=" + breite + ",height=" + hoehe + ",resizable=0,status=0,scrollbars=0,toolbar=0,location=0,directories=0,menubar=0";
    	newwin = window.open( myfile , myname , params)	;
		temp = newwin;
		temp.name = "temp";
		newwin="";
		}
}