显示/隐藏form中所有select

/**
* Hides all drop down form select boxes on the screen so they do not appear above the mask layer.
* IE has a problem with wanted select form tags to always be the topmost z-index or layer
*
* Thanks for the code Scott!
*/
function hideSelectBoxes() {
 for(var i = 0; i < document.forms.length; i++) {
  for(var e = 0; e < document.forms[i].length; e++){
   if(document.forms[i].elements[e].tagName == "SELECT") {
    document.forms[i].elements[e].style.visibility="hidden";
   }
  }
 }
}/**
* Makes all drop down form select boxes on the screen visible so they do not reappear after the dialog is closed.
* IE has a problem with wanted select form tags to always be the topmost z-index or layer
*/
function displaySelectBoxes() {
 for(var i = 0; i < document.forms.length; i++) {
  for(var e = 0; e < document.forms[i].length; e++){
   if(document.forms[i].elements[e].tagName == "SELECT") {
   document.forms[i].elements[e].style.visibility="visible";
   }
  }
 }
}