if (document.images) {            

        img1on = new Image();   img1on.src = "images/wel1b.jpg";

	    img2on = new Image();   img2on.src = "images/wel2b.jpg";

	    img3on = new Image();   img3on.src = "images/wel3b.jpg"; 

	    img4on = new Image();   img4on.src = "images/wel6b.jpg";    

	    img5on = new Image();   img5on.src = "images/wel7b.jpg";    

	    img6on = new Image();   img6on.src = "images/wel8b.jpg";    

      			

        img1off = new Image();  img1off.src = "images/wel1.jpg";

 	    img2off = new Image();  img2off.src = "images/wel2.jpg";

 	    img3off = new Image();  img3off.src = "images/wel3.jpg";

 	    img4off = new Image();  img4off.src = "images/wel6.jpg";            

 	    img5off = new Image();  img5off.src = "images/wel7.jpg";            

 	    img6off = new Image();  img6off.src = "images/wel8.jpg";            

        }



    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");        

            }

    }