function checkGrupper(select) {
	var children = select.options;
	var i = 0;
	
	if (children[0].value == '-' && children[0].selected) {
		children[0].selected = false;
		for (i = 1; i < children.length; i++)
			if (children[i].value != '')
				children[i].selected = true;
	} else {
		while (i < children.length) {
			if (children[i++].value == '') {
				var selected = children[i - 1].selected;
				children[i - 1].selected = false;
				while (children[i].value != '' && children[i].text.indexOf('-') == 1 && i < children.length) {
				        if (selected)
						children[i].selected = true;
					i++;
				}
			}
		}
	}
}