function uniformity() {
	if(document.getElementById('content_left')) {
		col1 = document.getElementById('content_left').offsetHeight;
		col2 = document.getElementById('content_center').offsetHeight;
		col3 = document.getElementById('content_right').offsetHeight;

		if(col1 >= col2 && col1 >= col3) { resize = col1; }
		else if(col2 >= col1 && col2 >= col3) { resize = col2; }
		else { resize = col3; }

		document.getElementById('content_left').style.height = resize + 'px';
		document.getElementById('content_center').style.height = resize + 'px';
		document.getElementById('content_right').style.height = resize + 'px';
	}
}

function showmenu(imageid, divid) {
	if(divid) {
		if(typeof(hideid) != 'undefined' && hideid == divid) { clearTimeout(hidetimer); }

		cur = document.getElementById(imageid);

		coord_left = 0;
		while(cur.tagName != 'BODY') {
			coord_left += cur.offsetLeft;
			cur = cur.offsetParent;
		}

		cur = document.getElementById(imageid);
		coord_top = 0;
		while(cur.tagName != 'BODY') {
			coord_top += cur.offsetTop;
			cur = cur.offsetParent;
		}
		coord_top += document.getElementById(imageid).offsetHeight;

		document.getElementById(divid).style.position = 'absolute';
		document.getElementById(divid).style.top = coord_top + 'px';
		document.getElementById(divid).style.left = coord_left + 'px';
		document.getElementById(divid).style.display = 'block';
	}

	if(document.getElementById(imageid).src.indexOf('_on.gif') <= 0) {
		document.getElementById(imageid).src = document.getElementById(imageid).src.replace('.gif', '_on.gif');
	}
}

function hidemenu(imageid, divid) {
	if(divid) {
		hidetimer = setTimeout("document.getElementById('" + divid + "').style.display = 'none';", 50);
		hideid = divid;
	}

	if(document.getElementById(imageid).src.indexOf('_on.gif') > 0) {
		document.getElementById(imageid).src = document.getElementById(imageid).src.replace('_on.gif', '.gif');
	}
}