function bgcheck() {
	
	if(document.getElementById('searchbox').value != ""){
		document.getElementById('searchbox').style.backgroundImage = "url('http://www.ivesound.jp/image/common/bg_search_none.gif')";
	}
}

function bgImgSearchbox() {
	document.getElementById('searchbox').style.backgroundImage = "url('http://www.ivesound.jp/image/common/bg_search_none.gif')";
}

function bgImgSearchbox2() {
	if(document.getElementById('searchbox').value == "") {
		 document.getElementById('searchbox').style.backgroundImage = "url('http://www.ivesound.jp/image/common/bg_search.gif')";
	}
}