if (navigator.userAgent.indexOf("Mozilla/4") >= 0){
	Image1 = new Image()
	Image1.src = "images/nav_home_over.gif"
	Image2 = new Image()
	Image2.src = "images/nav_about_over.gif"
	Image3 = new Image()
	Image3.src = "images/nav_clients_over.gif"
	Image4 = new Image()
	Image4.src = "images/nav_contact_over.gif"
	
}

function rollin(imagenum){
	document.images[ imagenum ].src= "images/nav_" + imagenum + "_over.gif";
}
			
function rollout(imagenum){
	document.images[ imagenum ].src= "images/nav_" + imagenum + "_off.gif";
}