// 이미지 오버
function initImgOver(as_ID) {
	var rollNav = document.getElementById(as_ID);	
	var rollLan = rollNav.childNodes.length;	
	var rollItem;	
	var rollAnchor;
	var rollImg;	
	
	for (var i=0; i<rollLan; i++) {
		rollItem = rollNav.childNodes.item(i);
		if (rollItem.tagName != "LI") {
			continue;
		}
		rollAnchor = rollItem.getElementsByTagName("span").item(0);
		if (rollAnchor.className != "over") {
			rollAnchor.onmouseover = rollAnchor.onfocus = function () {
				if (rollNav.current) {
					rollImg = rollNav.current.childNodes.item(0);
					rollImg.src = rollImg.src.replace("_on.png", ".png");
					rollNav.current = null;				
				}
				if ((rollNav.current == null) || (rollNav.current != this)) {
					rollImg = this.childNodes.item(0);
					rollImg.src = rollImg.src.replace(".png", "_on.png");
					rollNav.current = this;
				}
				rollNav.isOver = true;			
			}
			rollAnchor.onmouseout = rollAnchor.onblur = function () {
				if (rollNav.current) {
					rollImg = rollNav.current.childNodes.item(0);
					rollImg.src = rollImg.src.replace("_on.png", ".png");
					rollNav.current = null;				
				}
			}
		}
	}	
}