function img(id)
{
	if(document.getElementById(id).className=="main-image-left")
	{
		document.getElementById(id).className="main-image-left-hover";
	}
	else if(document.getElementById(id).className=="main-image-left-hover")
	{
		document.getElementById(id).className="main-image-left";
	}
	else if(document.getElementById(id).className=="main-image-right")
	{
		document.getElementById(id).className="main-image-right-hover";
	}
	else if(document.getElementById(id).className=="main-image-right-hover")
	{
		document.getElementById(id).className="main-image-right";
	}
}