if(document.images){
	
	all_btn02on=new Image();
	all_btn02on.src="../images/all_btn02_on.gif";
	
	all_btn03on=new Image();
	all_btn03on.src="../images/all_btn03_on.gif";
	
	navi_btn01on=new Image();
	navi_btn01on.src="../images/all_navi_btn01_on.gif";
	
	navi_btn02on=new Image();
	navi_btn02on.src="../images/all_navi_btn02_on.gif";
	
	navi_btn03on=new Image();
	navi_btn03on.src="../images/all_navi_btn03_on.gif";
	
	navi_btn04on=new Image();
	navi_btn04on.src="../images/all_navi_btn04_on.gif";
	
	navi_btn05on=new Image();
	navi_btn05on.src="../images/all_navi_btn05_on.gif";
	
	index_btn01on=new Image();
	index_btn01on.src="../images/index_btn01_on.gif";
	
	
	
	all_btn02off=new Image();
	all_btn02off.src="../images/all_btn02_off.gif";
	
	all_btn03off=new Image();
	all_btn03off.src="../images/all_btn03_off.gif";
	
	navi_btn01off=new Image();
	navi_btn01off.src="../images/all_navi_btn01_off.gif";
	
	navi_btn02off=new Image();
	navi_btn02off.src="../images/all_navi_btn02_off.gif";
	
	navi_btn03off=new Image();
	navi_btn03off.src="../images/all_navi_btn03_off.gif";
	
	navi_btn04off=new Image();
	navi_btn04off.src="../images/all_navi_btn04_off.gif";
	
	navi_btn05off=new Image();
	navi_btn05off.src="../images/all_navi_btn05_off.gif";
	
	index_btn01off=new Image();
	index_btn01off.src="../images/index_btn01_off.gif";
	
}



function btnOn(imgName){

	if(document.images){

		document[imgName].src=eval(imgName+"on.src");

	}

}

function btnOff(imgName){

	if(document.images){

		document[imgName].src=eval(imgName+"off.src");

	}

}