if (document.images) {            


		img1on = new Image();      
		img1on.src = "images/btn_home_on.gif";

		img1off = new Image(); 
		img1off.src = "images/btn_home_off.gif"; 

		img2on = new Image();      
		img2on.src = "images/btn_aboutus_on.gif";

		img2off = new Image(); 
		img2off.src = "images/btn_aboutus_off.gif";

		img3on = new Image();      
		img3on.src = "images/btn_contact_on.gif";

		img3off = new Image(); 
		img3off.src = "images/btn_contact_off.gif";

		img4on = new Image();      
		img4on.src = "images/btn_ourmodels_on.gif";

		img4off = new Image(); 
		img4off.src = "images/btn_ourmodels_off.gif"; 
		
		img5on = new Image();      
		img5on.src = "images/btn_search_on.gif";

		img5off = new Image(); 
		img5off.src = "images/btn_search_off.gif"; 
   

}

// Function to 'activate' images.
function imgOn(imgName) {
        if (document.images) {
            document[imgName].src = eval(imgName + "on.src");
        }
}

// Function to 'deactivate' images.
function imgOff(imgName) {
        if (document.images) {
            document[imgName].src = eval(imgName + "off.src");
        }
}