function getW(){
    var w;
    if(document.innerWidth){ w=document.innerWidth;
    } else if(document.documentElement.clientWidth){ w=document.documentElement.clientWidth;
    } else if(document.body){ w=document.body.clientWidth; }
    return w;
}

function getH(){
    var h;
    if(document.innerHeight){ h=document.innerHeight;
    } else if(document.documentElement.clientHeight){ h=document.documentElement.clientHeight;
    } else if(document.body){ h=document.body.clientHeight; }
    return h;
}

function setFooter() { 
    if (document.getElementById) { 
        var pageheight = document.getElementById('main_content').offsetHeight + document.getElementById('main_content').offsetTop;
        if (pageheight > 0) {
            //winheight = document.body.clientHeight || innerHeight;
            var winheight = getH();
            if (pageheight < winheight-93) {
                pageheight = winheight-93;
            } 
            if (pageheight < 650) {
                pageheight = 650;
            }
            var pageElement = document.getElementById('main'); 
            pageElement.style.height = pageheight + 'px';         
        }         
    }         
}

function toggleTransfer(){
    if (document.getElementById) {
        if (document.getElementById('nlTransferOrder').checked == true) {
            document.getElementById('nlTransferCity').disabled = false;    
            document.getElementById('nlTransferFlightNumber').disabled = false;    
            document.getElementById('nlTransferFrom').disabled = false;    
            document.getElementById('nlTransferNrOfPersons').disabled = false;    
        } else {
            document.getElementById('nlTransferCity').disabled = true;    
            document.getElementById('nlTransferFlightNumber').disabled = true;    
            document.getElementById('nlTransferFrom').disabled = true;    
            document.getElementById('nlTransferNrOfPersons').disabled = true;    
        }
    }    
    return false;
}