var btn_a_ary = ["btn_idea_r.jpg","btn_ceo_r.jpg","btn_staff_r.jpg","btn_comapny_r.jpg"];

function about_init(){
	for(var cnt = 0; cnt < btn_a_ary.length; cnt++){
		var imgObj = new Image();
		imgObj.src = "images/about_common/"+btn_a_ary[cnt];
	}
}

function onAboutLoad( aID )
{
	var imgObj = document.getElementById( aID );
	imgObj.src = "images/about_common/"+aID+"_r.jpg";
}

function offAboutLoad( aID )
{
	var imgObj = document.getElementById( aID );
	imgObj.src = "images/about_common/"+aID+".jpg";
}

about_init();