if (document.images) {

	var swap = new Array();
	var names = new Array("arrow","arrow_main");

	for (n in names) {
		var name = names[n];
		                        
		swap[name + "_off"] = new Image();
		swap[name + "_off"].src = "images_nav_side/nav_" + name + ".gif";
		                        
		swap[name + "_on"] = new Image();
		swap[name + "_on"].src = "images_nav_side/nav_" + name + "_over.gif";
	}

}

function mson(imgName) {
	if (document.images) {
	document.images[imgName].src = swap[imgName + "_on"].src;
	}
}

function msoff(imgName) {
	if (document.images) {
	document.images[imgName].src = swap[imgName + "_off"].src;
	}
}

function arrow_on(imgName) {
	if (document.images) {
	document.images[imgName].src = swap["arrow_on"].src;
	}
}

function arrow_off(imgName) {
	if (document.images) {
	document.images[imgName].src = swap["arrow_off"].src;
	}
}

function arrow_main_on(imgName) {
	if (document.images) {
	document.images[imgName].src = swap["arrow_main_on"].src;
	}
}

function arrow_main_off(imgName) {
	if (document.images) {
	document.images[imgName].src = swap["arrow_main_off"].src;
	}
}