function Switch(item,on) {
var sTmp;
  if (item == "services")  {
  if (on)    {
  sTmp = "this.document." + item +".src = \"images/services_on.gif\"";
  eval(sTmp); 
  } else {
  sTmp = "this.document." + item +".src = \"images/services.gif\"";
  eval(sTmp);
  }
  } 
  if (item == "about")  {
  if (on)    {
  sTmp = "this.document." + item +".src = \"images/about_on.gif\"";
  eval(sTmp); 
  } else {
  sTmp = "this.document." + item +".src = \"images/about.gif\"";
  eval(sTmp);
  }
  }
  if (item == "contact")  {
  if (on)    {
  sTmp = "this.document." + item +".src = \"images/contact_on.gif\"";
  eval(sTmp); 
  } else {
  sTmp = "this.document." + item +".src = \"images/contact.gif\"";
  eval(sTmp);
  }
  }
 
  
  }