function displaySearchOption() {
	document.getElementById('searchRegularButton').style.display = "none";
	document.getElementById('searchOptionOpenSwitch').style.display = "none";
	document.getElementById('searchFeatureKeywords').style.display = "none";
	document.getElementById('searchOption').style.display = "block";
}

function undisplaySearchOption() {
	clearOptions();
	document.getElementById('searchRegularButton').style.display = "inline";
	document.getElementById('searchOptionOpenSwitch').style.display = "inline";
	document.getElementById('searchFeatureKeywords').style.display = "block";
	document.getElementById('searchOption').style.display = "none";
}

function clearOptions() {
	var f = document.forms[0];
	for(var i=0;i<f.elements.length;i++) {
		if(f.elements[i].type == "radio" || f.elements[i].type == "checkbox"){
			f.elements[i].checked = false;
		}
	}
	f.elements["search_phrase"].value = "";
}