function overMenu(i) {
	document.getElementById('over2').style.display = "none";
	document.getElementById('over3').style.display = "none";
	document.getElementById('over4').style.display = "none";
	document.getElementById('over5').style.display = "none";
	if(i!=1)	document.getElementById('over'+i).style.display = "block";
}
function rollout(i) {
	if (navigator.appVersion.indexOf("MSIE 7") > -1){  // ºê¶ó¿ìÀú ¹öÀü IE7  ÀÏ°æ¿ì
		} else { //³ª¸ÓÁö
		if(i!=1)	document.getElementById('over'+i).style.display = "none";
	}
}

function showHide(str) {
	if(document.getElementById(str).childNodes[0].childNodes[1].style.backgroundPosition != "0px -24px") {
	document.getElementById(str).childNodes[1].style.display = "none";
	document.getElementById(str).childNodes[0].childNodes[1].style.backgroundPosition = "0px -24px";
	}
	else {
	document.getElementById(str).childNodes[1].style.display = "block";
	document.getElementById(str).childNodes[0].childNodes[1].style.backgroundPosition = "0 0";
	}
}