if (document.images)
        {
                b01a=new Image()
                b01a.src="images/b01a.gif"
                b01b=new Image()
                b01b.src="images/b01b.gif"

                b02a=new Image()
                b02a.src="images/b02a.gif"
                b02b=new Image()
                b02b.src="images/b02b.gif"

                b03a=new Image()
                b03a.src="images/b03.gif"
                b03b=new Image()
                b03b.src="images/b03a.gif"

                b04a=new Image()
                b04a.src="images/b04.gif"
                b04b=new Image()
                b04b.src="images/b04a.gif"

                b05a=new Image()
                b05a.src="images/b05.gif"
                b05b=new Image()
                b05b.src="images/b05a.gif"

                b06a=new Image()
                b06a.src="images/b06.gif"
                b06b=new Image()
                b06b.src="images/b06a.gif"

                b07a=new Image()
                b07a.src="images/b07.gif"
                b07b=new Image()
                b07b.src="images/b07a.gif"

		b08a=new Image()
                b08a.src="images/b08.gif"
                b08b=new Image()
                b08b.src="images/b08a.gif"

 		b09a=new Image()
                b09a.src="images/b09.gif"
                b09b=new Image()
                b09b.src="images/b09a.gif"

 		b10a=new Image()
                b10a.src="images/b10.gif"
                b10b=new Image()
                b10b.src="images/b10a.gif"

 		b11a=new Image()
                b11a.src="images/b11.gif"
                b11b=new Image()
                b11b.src="images/b11a.gif"

 		b12a=new Image()
                b12a.src="images/b12.gif"
                b12b=new Image()
                b12b.src="images/b12a.gif"

 		b13a=new Image()
                b13a.src="images/b13.gif"
                b13b=new Image()
                b13b.src="images/b13a.gif"

 		b14a=new Image()
                b14a.src="images/b14.gif"
                b14b=new Image()
                b14b.src="images/b14a.gif"

 		b15a=new Image()
                b15a.src="images/b15.gif"
                b15b=new Image()
                b15b.src="images/b15a.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");
        }
}