function showhide(obj) {
  var arrServices = ['statisk', 'dynamisk', 'nettverk', 'support'];
  layer = document.getElementById(obj);
  
  if(layer.style.display && layer.style.display == 'block') {
    layer.style.display = 'none';
  } else {
    layer.style.display = 'block';
    for (i=0;i<arrServices.length;i++) {
      if(!(arrServices[i]==obj)) {
        service = document.getElementById(arrServices[i])
        service.style.display = 'none';
      }
    }
  }	
}

function fSynchronousPost(felt, verdi) { 
  var oXMLHttpRequest = new XMLHttpRequest; 
  oXMLHttpRequest.open("POST", "validate.php", false); 
  oXMLHttpRequest.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
  oXMLHttpRequest.onreadystatechange = function() { 
    if (this.readyState == XMLHttpRequest.DONE) { 
      document.contact.ok.value=oXMLHttpRequest.responseText; 
    } 
  } 
  sendData = felt + "=" + verdi;
  oXMLHttpRequest.send(sendData); 
}