function msover (imgName)
{
	var new_im = null;
	
	if ( document.images )
	{
		new_im = eval(imgName + "_on.src");
		document.images[imgName].src = new_im;
	}
    
}
 
function msout ( imgName )
{
	var new_im = null;
	
	if ( document.images )
	{
		new_im = eval(imgName + "_off.src");
		document.images[imgName].src = new_im;
	}

}