if (document.images) 
  {
    homeText = new Image
    homeonText = new Image
    homeoverText = new Image
 	aboutusText = new Image
 	aboutusonText = new Image
 	aboutusoverText = new Image
 	guidelinesText = new Image
 	guidelinesonText = new Image
 	guidelinesoverText = new Image
 	servicesText = new Image
 	servicesonText = new Image
 	servicesoverText = new Image
 	contactusText = new Image
 	contactusonText = new Image
 	contactusoverText = new Image

 	homeText.src = "images/home.gif"
 	homeonText.src = "images/home-on.gif"
 	homeoverText.src = "images/home-over.gif"
 	aboutusText.src = "images/about.gif"
 	aboutusonText.src = "images/about-on.gif"
 	aboutusoverText.src = "images/about-over.gif"
 	guidelinesText.src = "images/guidelines.gif"
 	guidelinesonText.src = "images/guidelines-on.gif"
 	guidelinesoverText.src = "images/guidelines-over.gif"
 	servicesText.src = "images/services.gif"
 	servicesonText.src = "images/services-on.gif"
 	servicesoverText.src = "images/services-over.gif"
 	contactusText.src = "images/contact.gif"
 	contactusonText.src= "images/contact-on.gif"
 	contactusoverText.src = "images/contact-over.gif"
  }
  
function chgImg(imgField,newImg)
 {
  if (document.images) 
   {
    document[imgField].src = eval(newImg + ".src") 	
  	}
 }