// preload an image set
function preloadIMG(base) {
  document.writeln('<script>')
  document.writeln(base,'_dn=new Image(); ',base,'_dn.src="',base,'_dn.jpg";')
  document.writeln(base,'_on=new Image(); ',base,'_on.src="',base,'_on.jpg";')
  document.writeln(base,'_ex=new Image(); ',base,'_ex.src="',base,'_ex.jpg";')
  document.writeln('</script>')
 }

// place a button
function placeButton(url,base,prompt) {
  var qprompt="'"+prompt+"'"
  var eprompt="''"
  preloadIMG(base);
  document.write('<a href="',url,'" onMouseOver="document.',base,'Name.src=',base,'_on.src; status=',qprompt,'; return true" onMouseDown="document.',base,'Name.src=',base,'_dn.src"')
  document.write(' onMouseUp="document.',base,'Name.src=',base,'_on.src" onMouseOut="document.',base,'Name.src=',base,'_ex.src; status=',eprompt,'; return true">')
  document.write('<img name=',base,'Name width=125 height=35 border=0 alt="',prompt,'" src="',base,'_ex.jpg"></a>')
 }