function select_all (form_id) {
	var form = document.getElementById(form_id);
	if (!form) {return false;}
	var to;
	var input_select_all = document.getElementById("input_select_all");
	if (input_select_all.checked == true) {
		to = true;
	}else{
		to = false;
	}
	var trs = document.getElementsByTagName('tr');
	for (var x=0;x<trs.length;x++) {
		var tds = trs[x].getElementsByTagName('td');
		if (tds.length > 1) {
			var inputs = tds[0].getElementsByTagName('input');
			if (inputs.length) {
				inputs[0].checked = to;
			}
		}
	}
}