var mapdiv; 
var map;

function onEnterTextBox(evt, frm) 
{
  var keyCode = null;
  if( evt.which ) 
  {
    keyCode = evt.which;
  } 
  else 
  {
    if( evt.keyCode ) 
    {
      keyCode = evt.keyCode;
    }
  }
  if( 13 == keyCode ) 
  {
    __doPostBack(frm,'');
    return false;
  }
  return true;
}

function wheelZoom(event) 
{ 
  if (window.event) { 
    event.returnValue = false; // IE 
  } 
  if (event.cancelable) { 
    event.preventDefault();  // DOM-Standard 
  } 
  return false; 
}