if (document.images) { 
		img1on = new Image();
		img1on.src = "images/home_over.gif"; 
		img1off = new Image(); 
		img1off.src = "images/home.gif"; 
		
		img2on = new Image();
		img2on.src = "images/services_over.gif"; 
		img2off = new Image(); 
		img2off.src = "images/services.gif"; 
		
		img3on = new Image();
		img3on.src = "images/contact_over.gif"; 
		img3off = new Image(); 
		img3off.src = "images/contact.gif"; 
		
		
	}
	
	function imgOn(imgName) {
		if (document.images) {
		document[imgName].src = eval(imgName + "on.src");}
	}
	function imgOff(imgName) {
		if (document.images) {
		document[imgName].src = eval(imgName + "off.src");}
	}