var clicked;
clicked = new Array(6);

function rollOver (imgName)
{
    eval("document.images." + imgName + ".src = 'images/" +
    imgName + "b.gif'");
}

function rollOut (imgName)
{
	if(!clicked[imgName.substring(2,3)]) 
	{
		document.images[imgName].src = eval("'images/" +
		imgName + "a.gif'");
    }
}

function turnOn (imgName)
{
	clearAll();
	clicked[imgName.substring(2,3)] = true;
	
    eval("document.images." + imgName + ".src = 'images/" +
    imgName + "b.gif'");
}

function clearAll () 
{
	clicked[1] = false;
	rollOut ('m01');
    clicked[2] = false;
    rollOut ('m02');
    clicked[3] = false;
    rollOut ('m03');
    clicked[4] = false;
    rollOut ('m04');
    clicked[5] = false;
    rollOut ('m05');
    clicked[6] = false;
    rollOut ('m06');
}