if (document.images) {
	var home1a = new Image();
	home1a.src = "images/buttons/home1a.gif"
	var profile1a = new Image();
	profile1a.src = "images/buttons/profile1a.gif"
	var services1a = new Image();
	services1a.src = "images/buttons/services1a.gif"
	var portfolio1a = new Image();
	portfolio1a.src = "images/buttons/portfolio1a.gif"
	var contact1a = new Image();
	contact1a.src = "images/buttons/contact1a.gif"

	var home1b = new Image();
	home1b.src = "images/buttons/home1b.gif"

	var profile1b = new Image();
	profile1b.src = "images/buttons/profile1b.gif"
	var services1b = new Image();
	services1b.src = "images/buttons/services1b.gif"
	var portfolio1b = new Image();
	portfolio1b.src = "images/buttons/portfolio1b.gif"
	var contact1b = new Image();
	contact1b.src = "images/buttons/contact1b.gif"
         }

         // highlight a link
         function highlight(img)
         {
	if (document.images)
	  document[img].src = eval(img + 'b.src')
         }

         // un-highlight a link
         function unhighlight(img)
         {
	if (document.images)
	  document[img].src = eval(img + 'a.src')
         }