function sethome() {
    document.getElementById('home').src = '/images/btn_home_over.jpg';
    document.getElementById ('btn_home_text').style.backgroundColor = '#cab377';
}
function setmares() {
    document.getElementById('mares').src = '/images/btn_mares_over.jpg';
    document.getElementById('btn_mares_text').style.backgroundColor = '#cab377';
}
function setseminars() {
    document.getElementById('seminars').src = '/images/btn_seminars_over.jpg';
    document.getElementById('btn_newcomers_text').style.backgroundColor = '#cab377';
}
function setabout() {
    document.getElementById('about').src = '/images/btn_contact_over.jpg';
    document.getElementById('btn_about_text').style.backgroundColor = '#cab377';
}
function setnews() {
    document.getElementById('news').src = '/images/btn_news_over.jpg';
    document.getElementById('btn_news_text').style.backgroundColor = '#cab377';
}

function getURLParam(strParamName){
var strReturn = "";
var strHref = window.location.href;
if ( strHref.indexOf("?") > -1 ){
var strQueryString = strHref.substr(strHref.indexOf("?")).toLowerCase();
var aQueryString = strQueryString.split("&");
for ( var iParam = 0; iParam < aQueryString.length; iParam++ ){
if (aQueryString[iParam].indexOf(strParamName + "=") > -1 ){
var aParam = aQueryString[iParam].split("=");
strReturn = aParam[1];
break;
}
}
}
return strReturn;
}