function imgSwap(oImg) {
	var strOver  = "Over";    // image to be used with mouse over
	var strOff = "Off";     // normal image
	var strImg = oImg.src;
	if (strImg.indexOf(strOver) != -1) { 
		oImg.src = strImg.replace(strOver,strOff);
	} else {
		oImg.src = strImg.replace(strOff,strOver);
	}
}