// Show a DIV
function show(id){
	if (document.getElementById){
		obj = document.getElementById(id);
		obj.style.display = "block";
	}	
}
// Hide a DIV
function hide(id){
	if (document.getElementById){
		obj = document.getElementById(id);
		obj.style.display = "none";
	}	
}
// Clear a set of checkboxes
function clearChecked(val,chkName) {
	var dml=document.getElementById('searchForm');
	len = dml.elements.length;
	var i=0;
	for( i=0 ; i<len ; i++) {
		if (dml.elements[i].name==chkName) {
			dml.elements[i].checked=val;
		}
	}
}

// Show - Hide CTAR sub categories
function toggleSubCategory (categoryIDToShow) {
	clearChecked(0,'subCategory');
	var listingType=document.getElementById('searchForm').listingType;
	//hide all divs first, then show selected
	for (var i=0; i<listingType.options.length; i++) {
		if (listingType[i].value != 4) { //skip over category 4 because it has no options
			hide('cat'+listingType[i].value);
		}
	}
	show('cat'+categoryIDToShow);
}