if (document.images)
        {
                btn1a=new Image()
                btn1a.src="images/btn1.gif"
                btn1b=new Image()
                btn1b.src="images/btn1a.gif"

                btn2a=new Image()
                btn2a.src="images/btn2.gif"
                btn2b=new Image()
                btn2b.src="images/btn2a.gif"

                btn3a=new Image()
                btn3a.src="images/btn3.gif"
                btn3b=new Image()
                btn3b.src="images/btn3a.gif"

                btn4a=new Image()
                btn4a.src="images/btn4.gif"
                btn4b=new Image()
                btn4b.src="images/btn4a.gif"

                btn5a=new Image()
                btn5a.src="images/btn5.gif"
                btn5b=new Image()
                btn5b.src="images/btn5a.gif"

                btn6a=new Image()
                btn6a.src="images/btn6.gif"
                btn6b=new Image()
                btn6b.src="images/btn6a.gif"

                btn7a=new Image()
                btn7a.src="images/btn7.gif"
                btn7b=new Image()
                btn7b.src="images/btn7a.gif"

		btn8a=new Image()
                btn8a.src="images/btn8.gif"
                btn8b=new Image()
                btn8b.src="images/btn8a.gif"

 		btn9a=new Image()
                btn9a.src="images/btn9.gif"
                btn9b=new Image()
                btn9b.src="images/btn9a.gif"

 		btn10a=new Image()
                btn10a.src="images/btn10.gif"
                btn10b=new Image()
                btn10b.src="images/btn10a.gif"

 		btn11a=new Image()
                btn11a.src="images/btn11.gif"
                btn11b=new Image()
                btn11b.src="images/btn11a.gif"

 		btn12a=new Image()
                btn12a.src="images/btn12.gif"
                btn12b=new Image()
                btn12b.src="images/btn12a.gif"

 		btn13a=new Image()
                btn13a.src="images/btn13.gif"
                btn13b=new Image()
                btn13b.src="images/btn13a.gif"

 		btn14a=new Image()
                btn14a.src="images/btn14.gif"
                btn14b=new Image()
                btn14b.src="images/btn14a.gif"

 		btn15a=new Image()
                btn15a.src="images/btn15.gif"
                btn15b=new Image()
                btn15b.src="images/btn15a.gif"
}



function imgOff(imgName)
        {
                if  (document.images);
        {
                document[imgName].src = eval (imgName + "a.src");
        }
}

function imgOn(imgName)
        {
                if  (document.images)
        {
                document [imgName].src = eval (imgName + "b.src");
        }
}