function checkReg() {
  var cb1 = document.getElementById("over18");
  var cb2 = document.getElementById("readterms");
  var valcb1 = document.getElementById("val_over18");
  var valcb2 = document.getElementById("val_readterms");
  valcb1.style.display = valcb2.style.display = "none";
  if (cb1.checked && cb2.checked) {
    return true;
  } else if ( false == cb1.checked ) {
    valcb1.style.display = "block";
    return false;
  } else if ( false == cb2.checked ) {
    valcb2.style.display = "block";
    return false;
  }
}

function toggleField(obj,val)
{
    if(obj.value == val)
    {
	    obj.value = "";
    }
    else if(obj.value == "")
    {
	    obj.value = val;
    }
}
function swapImage(obj,val)
{
    if(document.images){
        obj.src = val;
    }
}