//============ÏÔʾ===========
function show(id) {
  if(document.getElementById(id)) {
    document.getElementById(id).style.display = "block";
    // toggle hidden form element if it exists
    if( document.getElementById(id + 'DIV') ) {
      document.getElementById(id + 'DIV').value = "show";
    }
    // toggle image if it exists
    if( document.getElementById(id + 'IMG') ) {
      document.getElementById(id + 'IMG').src = "expand_files/form_expanded.gif";
    }
    // toggle header image if it exists
    if( document.getElementById(id + 'HDR') ) {
      document.getElementById(id + 'HDR').src = "expand_files/hdr_expanded.gif";
    }
    // toggle header image if it exists
    if( document.getElementById(id + 'MOD') ) {
      document.getElementById(id + 'MOD').className = "moduleExpanded";
    }
  }
}

//==============Òþ²Ø=========
function hide(id) {
  if(document.getElementById(id)) {
    document.getElementById(id).style.display = "none"; 
    // toggle hidden form element if it exists
    if( document.getElementById(id + 'DIV') ) {
      document.getElementById(id + 'DIV').value = "hide";
    }
    // toggle image if it exists
    if( document.getElementById(id + 'IMG') ) {
      document.getElementById(id + 'IMG').src = "expand_files/form_collapsed.gif";
    }
    // toggle header image if it exists
    if( document.getElementById(id + 'HDR') ) {
      document.getElementById(id + 'HDR').src = "expand_files/hdr_collapsed.gif";
    }
    // toggle header image if it exists
    if( document.getElementById(id + 'MOD') ) {
      document.getElementById(id + 'MOD').className = "moduleCollapsed";
    }
  }
}