function section_navi(){
	if(document.getElementById('section_header')){
		var $titles = new Array;
		$titles = document.getElementById('section_titles').getElementsByTagName('img');
		var $links = new Array;
		$links = document.getElementById('section_links').getElementsByTagName('img');
		var $preload = new Array();
		var $pre = 0;
		for(i=0; i<$links.length; i++){
			if ($links[i].getAttribute('hvr')){
				$preload[$pre] = new Image();
				$preload[$pre] = $links[i].getAttribute('hvr');	
			}
			$links[i].onmouseover = function(){
				var $show = this.getAttribute('show');
				if (this.getAttribute('hvr')){
					var $src = this.getAttribute('src');
					var $hvr = this.getAttribute('hvr');
					this.setAttribute('src',$hvr);
					this.setAttribute('hvr',$src);
				}
				if (document.getElementById($show)) document.getElementById($show).style.visibility = "visible";
			}
			$links[i].onmouseout = function(){
				if (this.getAttribute('hvr')){
					var $src = this.getAttribute('hvr');
					var $hvr = this.getAttribute('src');
					this.setAttribute('hvr',$hvr);
					this.setAttribute('src',$src);
				}
				for(i=0; i<$titles.length; i++){
					$titles[i].style.visibility = "hidden";
				}
			}
		}
	}
}
window.onload = section_navi;