img1on = new Image();
img1on.src = "pics/services.gif"
img2on = new Image();
img2on.src = "pics/docs.gif"
img3on = new Image();
img3on.src = "pics/nurse.gif"
img4on = new Image();
img4on.src = "pics/stuff.gif"

img1off = new Image();
img1off.src = "pics/sickdogpk.gif"
img2off = new Image();
img2off.src = "pics/docpk.gif"
img3off = new Image();
img3off.src = "pics/nursepk.gif"
img4off = new Image();
img4off.src = "pics/stuffpk.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");
		}
}