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