function button(Name,File,tagle)
 {
  if (tagle)
        {
		  document.images[Name].src = eval(File + "off.src");
		  }
      else
        {document.images[Name].src = eval(File + "on.src");}
}
{
  but1on = new Image();
  but1on.src ="/img-main/mv1a.jpg";
  but1off = new Image();
  but1off.src ="/img-main/mv1b.jpg";
  but2on = new Image();
  but2on.src ="/img-main/mv2a.jpg";
  but2off = new Image();
  but2off.src ="/img-main/mv2b.jpg";
  but3on = new Image();
  but3on.src ="/img-main/mv3a.jpg";
  but3off = new Image();
  but3off.src ="/img-main/mv3b.jpg";
  but4on = new Image();
  but4on.src ="/img-main/mv4a.jpg";
  but4off = new Image();
  but4off.src ="/img-main/mv4b.jpg";	
}