if (document.images) {

                  

            img1on = new Image(); 

            img1on.src = "images/ovex.gif";   



                

            img1off = new Image(); 

            img1off.src = "images/animsp.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");

        }

}