function setAllVisibility()
{
  setVisibility('whatyouwant1', 'contact_pcwork');
  setVisibility('whatyouwant2', 'contact_telecom');
  setVisibility('whatyouwant3', 'contact_other');
  setVisibility('whatyouwant4', 'contact_comment');
}  

function setVisibility(parent, child)
{
	radio = document.getElementById(parent);
	div = document.getElementById(child);
	if (radio.checked)
	{
		div.style.display = 'block';
	}
	else
	{
		div.style.display = 'none';
	}
}

function switchDiv(div_id)
{
  var style_sheet = getStyleObject(div_id);
  if (style_sheet)
  {
    hideAll();
    changeObjectVisibility(div_id, "block");
  }
  else 
  {
    alert("sorry, this only works in browsers that do Dynamic HTML");
  }
}

function getStyleObject(objectId) {
  // checkW3C DOM, then MSIE 4, then NN 4.
  //
  if(document.getElementById && document.getElementById(objectId)) {
        return document.getElementById(objectId).style;
   }
   else if (document.all && document.all(objectId)) {  
        return document.all(objectId).style;
   } 
   else if (document.layers && document.layers[objectId]) { 
        return document.layers[objectId];
   } else {
        return false;
   }
}

function changeObjectVisibility(objectId, newVisibility) {
    // first get the object's stylesheet
    var styleObject = getStyleObject(objectId);

    // then if we find a stylesheet, set its visibility
    // as requested
    //
    if (styleObject) {
    //    styleObject.visibility = newVisibility;
        styleObject.display = newVisibility;
        return true;
    } else {
        return false;
    }
}

function hideAll()
{
   changeObjectVisibility("contact_pcwork","none");
   changeObjectVisibility("contact_telecom","none");
   changeObjectVisibility("contact_other","none");
   changeObjectVisibility("contact_comment","none");
}