function changeFilterDate(date_value)
{
    document.forms['datatype_list_filter'].elements['date'].value = date_value;
    document.forms['datatype_list_filter'].submit();
    return true;
}


// used to clear the "subscribe to email newsletter" box only once, the first time it is entered
var email_entered = new Array();
function clear_email(form, field)
{
    if(!email_entered[form+'.'+field])
    {
        document.forms[form].elements[field].value = "";
        email_entered[form+'.'+field] = true;
    }
}

function restore_text(form, field, text)
{
    if("" == document.forms[form].elements[field].value)
    {
        document.forms[form].elements[field].value = text;
        email_entered[form+'.'+field] = false;
    }
}

function newImage(arg) {
	if (document.images) {
		rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
}

function changeImages() {
	if (document.images && (preloadFlag == true)) {
		for (var i=0; i<changeImages.arguments.length; i+=2) {
			document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
		}
	}
}

var preloadFlag = false;
function preloadImages() {
	if (document.images) {
		mainnav_01_over = newImage("/images/mainnav_01-over.gif");
		mainnav_02_over = newImage("/images/mainnav_02-over.gif");
		mainnav_03_over = newImage("/images/mainnav_03-over.gif");
		mainnav_04_over = newImage("/images/mainnav_04-over.gif");
		mainnav_05_over = newImage("/images/mainnav_05-over.gif");
		mainnav_06_over = newImage("/images/mainnav_06-over.gif");
		preloadFlag = true;
	}
}