var isDOM = (document.getElementById ? true : false); 
var isIE4 = ((document.all && !isDOM) ? true : false);
var isNS4 = (document.layers ? true : false);

function getRef(id) {
if (isDOM) return document.getElementById(id);
if (isIE4) return document.all[id];
if (isNS4) return document.layers[id];
}

function unHideImages() {
	var vis = 'visible';
	getRef('sabrient_logo').style.visibility = vis;
	getRef('top_img_home_01').style.visibility = vis;
	getRef('top_img_home_02').style.visibility = vis;
	getRef('top_img_home_03').style.visibility = vis;
	getRef('top_img_home_04').style.visibility = vis;
	getRef('top_img_home_05').style.visibility = vis;
	getRef('top_index').style.visibility = vis;
	getRef('logo_top').style.visibility = vis;
	getRef('index_quotation').style.visibility = vis;
}