if (document.images) 
	{
	button1 = new Image()
	button1.src = "images/btn_home.gif"
	button1over = new Image()
	button1over.src = "images/btn_home_on.gif"

	button2 = new Image()
	button2.src = "images/btn_about.gif"
	button2over = new Image()
	button2over.src = "images/btn_about_on.gif"

     	button3 = new Image()
	button3.src = "images/btn_resume.gif"
	button3over = new Image()
	button3over.src = "images/btn_resume_on.gif"

	button4 = new Image()
	button4.src = "images/btn_case_studies.gif"
	button4over = new Image()
	button4over.src = "images/btn_case_studies_on.gif"
	}
function switchimage(string,i) 
	{
	if (document.images) eval("document.button" + i + ".src = " + string) 
	}
// -->