function dosearch(category) {
	document.forms["opportunities_list"].elements["category"].value = category;
	document.forms["opportunities_list"].submit();
}
function choosecategory() {
	var cat = document.forms["opportunities_nav"].elements["ID_category"].options[document.forms["opportunities_nav"].elements["ID_category"].selectedIndex].value;
	return cat;
}
function checkset(elem,val) {
// search by field value
	var i_len = document.forms["opportunities_list"].elements[elem].length
	for (var i=0; i < i_len; i++) {
		if (document.forms["opportunities_list"].elements[elem][i].value == val) {
			if (document.forms["opportunities_list"].elements[elem][i].checked == false) {
				document.forms["opportunities_list"].elements[elem][i].checked = true					
				}
			document.forms["opportunities_list"].elements[elem][i].focus()	
		}
	}
}