// Topnav images preloader

	function preLoad() {
		if (document.images) {
		imag = new Array()
		imag[0] = "images/btn_home0.gif"          
		imag[1] = "images/btn_home1.gif"  
		imag[2] = "images/btn_research0.gif" 
		imag[3] = "images/btn_research1.gif"  
		imag[4] = "images/btn_media0.gif"
		imag[5] = "images/btn_media1.gif"
		imag[6] = "images/btn_staff0.gif" 
		imag[7] = "images/btn_staff1.gif" 
		imag[8] = "images/btn_contact0.gif" 
		imag[9] = "images/btn_contact1.gif"
		imag[10] = "images/btnSub_research0.gif" 
		imag[11] = "images/btnSub_research1.gif"  
		imag[12] = "images/btnSub_growth0.gif"
		imag[13] = "images/btnSub_growth1.gif"
		imag[14] = "images/btnSub_defense0.gif" 
		imag[15] = "images/btnSub_defense1.gif" 
		imag[16] = "images/btnSub_philanthropy0.gif" 
		imag[17] = "images/btnSub_philanthropy1.gif"           


		im = new Array()
		for (var i = 0; i < imag.length; i++) {
         		im[i] = new Image()
         		im[i].src = imag[i]
        		}
        }
	}

// Image swap function
	function swap(num,imgname){
		if (document.images) {
			imgname.src = im[num].src;
		}
	}