window.onload=function(){
	setImageReplace();
}

function setImageReplace(){
	
	var target_uls=["gnavi","lnavi"];
	
	for(j=0;j<target_uls.length;j++){
		if(document.getElementById(target_uls[j])){
			if(document.getElementById(target_uls[j]).getElementsByTagName('li')[0]){
			target_images=document.getElementById(target_uls[j]).getElementsByTagName('li');
			
				for(var i=0;i<target_images.length;i++){
					target_image=document.getElementById(target_uls[j]).getElementsByTagName('li')[i];
					if(target_image.getElementsByTagName('a')[0] && target_image.getAttribute('class')!="here" && target_image.getAttribute('className')!="here"){
						if(target_image=target_image.getElementsByTagName('a')[0].getElementsByTagName('img')[0]){
							if(target_image.addEventListener){
									target_image.addEventListener('mouseover',imageon,false);
									target_image.addEventListener('mouseout',imageoff,false);
							}else if(target_image.attachEvent){
									target_image.attachEvent('onmouseover',imageon);
									target_image.attachEvent('onmouseout',imageoff);
							}
						}
					}
				}
			
			}
		}
	}
}

function imageon(evt){
	if(evt.currentTarget){
		var imagename=evt.target.src;
		if(imagename.lastIndexOf("_off.gif")!=1){
			imagename=imagename.substr(0,imagename.lastIndexOf("_off.gif"));
			evt.target.src=imagename + "_on.gif";
		}
	}else if(window.event){
		var imagename=evt.srcElement.src;
		if(imagename.lastIndexOf("_off.gif")!=1){
			imagename=imagename.substr(0,imagename.lastIndexOf("_off.gif"));
			evt.srcElement.src=imagename + "_on.gif";
		}
	}
}

function imageoff(evt){
	if(evt.currentTarget){
		var imagename=evt.target.src;
		if(imagename.lastIndexOf("_on.gif")!=-1){
			imagename=imagename.substr(0,imagename.lastIndexOf("_on.gif"));
			evt.target.src=imagename + "_off.gif";
		}
	}else if(window.event){
		var imagename=evt.srcElement.src;
		if(imagename.lastIndexOf("_on.gif")!=-1){
			imagename=imagename.substr(0,imagename.lastIndexOf("_on.gif"));
			evt.srcElement.src=imagename + "_off.gif";
		}
	}
}