var btn_ary = ["btn_news_r.jpg","btn_performance_r.jpg","btn_ourstyle_r.jpg","btn_results_r.jpg","btn_about_r.jpg","btn_recrutment_r.jpg"];

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

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

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

init();