img_names = new Array();
img_pre = new Array();
img_pre_h = new Array();
travado = true;

function imgover(imgName) {
	if (!travado){
		document.images[imgName].src = img_pre_h[imgName].src;
	}
}

function imgout(imgName) {
	if (!travado){
		document.images[imgName].src = img_pre[imgName].src;
	}
}

function init() {

	var j = 0;
	for (i=0; i<document.images.length; i++) {
		if (document.images[i].name != "") {
			img_names[j] = document.images[i].name;
			j++;
		}
	}

	for (i=0; i<img_names.length; i++) {
		img_pre[img_names[i]] = new Image();
		img_pre_h[img_names[i]] = new Image();
		img_src = document.images[img_names[i]].src;
		img_src_h = img_src.replace(".gif","_f2.gif");
		
		img_pre[img_names[i]].src = img_src;
		
		img_pre_h[img_names[i]].src = img_src_h;
	}
	travado = false;
}