var duffsportURL = "imgs/duffsport1.jpg";

if (document.images) {
     var duffsport1 = new Image();
     duffsport1.src = "imgs/duffsport1.jpg";

     var duffsport2 = new Image();
     duffsport2.src = "imgs/duffsport2.jpg";
	 
	 var duffsport3 = new Image();
	 duffsport3.src = "imgs/duffsport3.jpg";
	 
	 var duffsport4 = new Image();
	 duffsport4.src = "imgs/duffsport4.jpg";
	 
	 var duffsport5 = new Image();
	 duffsport5.src = "imgs/duffsport5.jpg";
	 
	 var duffsport6 = new Image();
	 duffsport6.src = "imgs/duffsport6.jpg";
	 
}

function changeDuffsport() {
     if (document.images) {
        if (duffsportURL == "imgs/duffsport1.jpg") duffsportURL = "imgs/duffsport2.jpg";
		else if (duffsportURL == "imgs/duffsport2.jpg") duffsportURL = "imgs/duffsport3.jpg";
		else if (duffsportURL == "imgs/duffsport3.jpg") duffsportURL = "imgs/duffsport4.jpg";
		else if (duffsportURL == "imgs/duffsport4.jpg") duffsportURL = "imgs/duffsport5.jpg";
		else if (duffsportURL == "imgs/duffsport5.jpg") duffsportURL = "imgs/duffsport6.jpg";

		
		
         document.myDuffsport.src = duffsportURL;
	}
}