function changeObjectVis(objectID,visibilityVal)
{
  var obj = document.getElementById(objectID);
  if(visibilityVal)
  {
    obj.style.display="block";
  }else{
    obj.style.display="none";
  }
}

function isChecked(checkboxname)
{
  var chkbox=document.getElementById(checkboxname);
  return chkbox.checked;
}

function changeSaleVis(saleVisible)
{
  changeObjectVis("spanPropSale",saleVisible);
}

function changePurchaseVis(purchaseVisible)
{
  changeObjectVis("spanPropPurchase",purchaseVisible);
}

function updateFields()
{
  changeObjectVis("spanCalContinue",true);
  if(isChecked("rdoActionType_sale_and_purchase"))
  {
    changeSaleVis(true);
    changePurchaseVis(true);
  }else{
    changeSaleVis(isChecked("rdoActionType_sale"));
    changePurchaseVis(isChecked("rdoActionType_purchase"));
  }
  changeObjectVis("spanRemortgage",isChecked("rdoActionType_remortgage"));  
  setTimeout("updateFields()",500);
}