function swap(img,over)
{
	var source=document.getElementById(img).src
	var sourcenew=""
	if(over && source.substr(source.length-6,2)!="_o")
	{
		sourcenew=source.substr(0,source.length-4)+"_o"+source.substr(source.length-4,4)
		document.getElementById(img).src=sourcenew;	
	}
	else if (!over && source.substr(source.length-6,2)=="_o")
	{
		sourcenew=source.substr(0,source.length-6)+source.substr(source.length-4,4)
		document.getElementById(img).src=sourcenew;
	}
	
	//alert(sourcenew)
}