function chngImg( vps)
{
	if ( document.getElementById( "iWH").className == "iWHs")
	{
		document.getElementById( "iWH").className = "iWHl"
		document.getElementById( "iWH").src = "images/" + vps + "_732.jpg";
		document.getElementById( "zoom").innerHTML = "zoom out";
	}
	else
	{
		document.getElementById( "iWH").className = "iWHs"
		document.getElementById( "iWH").src = "images/" + vps + "_256.jpg";
		document.getElementById( "zoom").innerHTML = "zoom in";
	}
}