function change_search_area(num){
	unradioall_area();
	document.getElementById("area" + num + "List").style.display = "block";
	document.getElementById("area" + num + "Link").className = "aOn";
	var areas = new Array('1', '2', '3', '4', '5', '6', '7', '8');
	for (i = 0; i < areas.length; i++) {
		if (areas[i] != num) {
			document.getElementById("area" + areas[i] + "List").style.display = "none";
			document.getElementById("area" + areas[i] + "Link").className = "";
		}
	}
}

function uncheckall_area() {
  var f = document.formobj;
	var objnms = 'pref[';
	var len = objnms.length;
	
	for (var frmcnt=0; frmcnt<f.length; frmcnt++){
		if (f.elements[frmcnt].type=='checkbox'){
			if (f.elements[frmcnt].name.substr(0,len)==objnms){
				f.elements[frmcnt].checked = false;
			}
		}
	}
}

function unradioall_area() {
  var f = document.formobj;
	var objnms = 'pref';
	var len = objnms.length;
	
	for (var frmcnt=0; frmcnt<f.length; frmcnt++){
		if (f.elements[frmcnt].type=='radio'){
			if (f.elements[frmcnt].name.substr(0,len)==objnms){
				f.elements[frmcnt].checked = false;
			}
		}
	}
}

function deleteDefault(element){
  if(element.defaultValue == element.value){
    element.value = "";
  }
}