function validateSearchString() {
	document.getElementById("simpleSearchTerm").value = trim(document.getElementById("simpleSearchTerm").value);
	if(document.getElementById("simpleSearchTerm").value=="" || document.getElementById("simpleSearchTerm").value=="*") {
		document.getElementById("searchError").innerHTML = "Please enter a search term";
		return false;
	}
	return true;
}

function validateAdvancedSearch() {
	document.getElementById("advancedSearchTerm1").value = trim(document.getElementById("advancedSearchTerm1").value);
	if(document.getElementById("advancedSearchTerm1").value=="" || document.getElementById("advancedSearchTerm1").value=="*") {
		document.getElementById("advancedSearchError").innerHTML = "Please enter a search term";
		return false;
	}
	return true;
}

function trim(stringToTrim) {
    stringToTrim = stringToTrim.replace( /^\s+/g, "" );
    return stringToTrim.replace( /\s+$/g, "" );
}

function toggleAdditionalSearchBar(){
	if (document.getElementById("isAdditionalSearchBarVisible").value=="true" ){
		document.getElementById("isAdditionalSearchBarVisible").value="false";
	}
	else{
        document.getElementById("isAdditionalSearchBarVisible").value="true";
	}
	showOrHideAdditionalSearchOptions();
}


function showOrHideAdditionalSearchOptions(){
	var PLUS_IMAGE_PATH = "/ec/images/plus.gif";
    var MINUS_IMAGE_PATH = "/ec/images/minus.gif";
    var ADDITIONAL_SEARCH_IMAGE_ID = "additionalSearchImage";
    var SUBJECTS_DIV_ID = "QSoptions";
    var imageText = document.getElementById(ADDITIONAL_SEARCH_IMAGE_ID).src;
    if(document.getElementById("isAdditionalSearchBarVisible").value=="true" ) {
        document.getElementById(ADDITIONAL_SEARCH_IMAGE_ID).src = MINUS_IMAGE_PATH;
        document.getElementById(ADDITIONAL_SEARCH_IMAGE_ID).alt = "Show fewer search options";
        document.getElementById(SUBJECTS_DIV_ID).style.display = 'block';
    }
    else{
        document.getElementById(ADDITIONAL_SEARCH_IMAGE_ID).src = PLUS_IMAGE_PATH;
        document.getElementById(ADDITIONAL_SEARCH_IMAGE_ID).alt = "Show more search options";
        document.getElementById(SUBJECTS_DIV_ID).style.display='none';
    }
}

window.onload=showOrHideAdditionalSearchOptions;