// activate a ceartian thumbnail
function thumb_none (e) {
	if ( e.originalTarget.parentNode !=  e.explicitOriginalTarget) {
		document.getElementById ("thumb-1").className="ag_small_left";
		document.getElementById ("thumb-2").className="ag_left_middle";
		document.getElementById ("thumb-3").className="ag_right_middle";
		document.getElementById ("thumb-4").className="ag_small_right";
	}
}

function thumb_1 (e) {
	document.getElementById ("thumb-1").className="ag_large_left";
	document.getElementById ("thumb-2").className="ag_small_middle";
	document.getElementById ("thumb-3").className="ag_small_middle";
	document.getElementById ("thumb-4").className="ag_small_right";
}

function thumb_2 (e) {
	document.getElementById ("thumb-1").className="ag_small_left";
	document.getElementById ("thumb-2").className="ag_large_middle";
	document.getElementById ("thumb-3").className="ag_small_middle";
	document.getElementById ("thumb-4").className="ag_small_right";
}

function thumb_3 (e) {
	document.getElementById ("thumb-1").className="ag_small_left";
	document.getElementById ("thumb-2").className="ag_small_middle";
	document.getElementById ("thumb-3").className="ag_large_middle";
	document.getElementById ("thumb-4").className="ag_small_right";
}

function thumb_4 (e) {
	document.getElementById ("thumb-1").className="ag_small_left";
	document.getElementById ("thumb-2").className="ag_small_middle";
	document.getElementById ("thumb-3").className="ag_small_middle";
	document.getElementById ("thumb-4").className="ag_large_right";
}