function Selection(toFieldPrimaryKey,tcUrl,toFieldValue,toFieldAdditionalKey)
{
   loIFrame=document.createElement("IFRAME")
   loIFrame.name="IFrameSelection"
   loIFrame.src=tcUrl
   loIFrame.frameBorder="0"
   loIFrame.scrolling="no"
   window.parent.document.body.appendChild(loIFrame)
}