Using the URL string to formulate a statement.

<script>
  /*////////////////////////////////////////////////////////////////////////////*/
/*/////////////////////////// PARSE QUERY STRING /////////////////////////////*/
/*////////////////////////////////////////////////////////////////////////////*/
      function parseQueryString( sQueryString )
      /*
        The function parseQueryString() has one optional argument,
        sQueryString.  That string should be in the form of the
        "document.location.query" property ( starts with a "?", attribute/values
        pairs are "&" delimited, attributes are separated from their
        corresponding value by "=", and all special characters ( such as ?, &,
        =, etc. ) should be HTTP escaped (i.e. "&" --> "%26" ).  If no
        argument is passed in the default sQueryString is the
        "document.location.query".
       
        This method returns an associative array (it's elements are named, so
        don't try to loop with and index, if you need to use a "for in" loop
        and be sure to ignore things like "length".  The named elements of the
        array will be the attributes of the query string and their values will
        be the value of that attribute in the query string.  All return values
        will be http unescaped (and will take care of the "+" to space
        conversion if necessary).
               
        ex:
          var aQuery = getFormPost( "?name=Quincy&mathProblem=2%2B2%3D4" );
         
          aQuery.name or aQuery[ "name" ] will return "Quincy";
          aQuery.mathProblem will return "2+2=4" (note the escaped "+");
      */
      {
        getStringToParse();
        splitStringToParse();
        createNameAndValueArrays();
        associateArrays();
        return aQueryString;
       
        /* Private Methods - parseQueryString() */
       
          function associateArrays()
          {
            for ( i = 0; i < aQueryStringNames.length; i++ )
            {
              if( !aQueryString[ aQueryStringNames[ i ] ] )
                aQueryString[ aQueryStringNames[ i ] ] = removePlus( aQueryStringValues[ i ] );
              else if( !aQueryString[ aQueryStringNames[ i ] ][ 0 ] )
              {
                var aNewArray = new Array();
                aNewArray.push( aQueryString[ aQueryStringNames[ i ] ] );
                aNewArray.push( removePlus( aQueryStringValues[ i ] ) );
                aQueryString[ aQueryStringNames[ i ] ] = aNewArray;
              }
              else                                                              // three or more items and the array has already been created
              {
                debugMe();
                aQueryString[ aQueryStringNames[ i ] ].push( removePlus( aQueryStringValues[ i ] ) );
                debugMe();
              }
                function debugMe()
                {
                  return;
                  alert( aQueryStringNames[ i ] + "\n" +
                         aQueryString[ aQueryStringNames[ i ] ] + "\n" +
                         "-->" + removePlus( aQueryStringValues[ i ] ) + "<--" + "\n" +
                         aQueryString[ aQueryStringNames[ i ] ].length + "\n" +
                          "-->" + aQueryString[ aQueryStringNames[ i ] ][ aQueryString[ aQueryStringNames[ i ] ].length -1 ] + "<--"
                   );
                   var ar = aQueryString[ aQueryStringNames[ i ] ];
                   var sar = "";
                   for ( x in ar )
                   {
                     sar+= x +":\t" + ar[ x ]+"\n";
                   }
                   alert( sar )
                }
            }
            /* Private Methods - associateArrays() */
           
              function removePlus(psEncodeString)
              {
                var lsRegExp = /\+/g;
                return unescape( String( psEncodeString ).replace( lsRegExp, " " ) );
              }
            /* Private Methods - associateArrays() */
          }
         
          function createNameAndValueArrays()
          {
            aQueryStringNames = new Array();
            aQueryStringValues = new Array();
            var aQueryString = sDelimitedString.split(" ");
            for ( i = 0, a=0; i < aQueryString.length - 1; i += 2, a++ )
            {
              aQueryStringNames[ a ] = aQueryString[ i ];
              aQueryStringValues[ a ] = aQueryString[ i + 1 ];
            }
          }
         
          function getStringToParse()
          {
            sQueryString = ( sQueryString || window.document.location.search );
            var iQueryStart = sQueryString.indexOf( "?" ) + 1;
            sQueryString = ( sQueryString.substring( iQueryStart, sQueryString.length ) );
            sStrippedString = ( sQueryString || window.document.location.search.substring( 1, document.location.search.length ) );
          }
         
          function splitStringToParse()
          {
            aQueryString = new Array();
            sDelimitedString = '';
            var splitString = sStrippedString.split( "&" );
            for ( i = 0; i < splitString.length; i++ )
            {
              removeAmpersandEntityRefs( i );
              var attribute = splitString[ i ].split( "=" );
              sDelimitedString+=attribute[ 0 ] + " " + attribute[ 1 ] + " ";
            }
            return sDelimitedString;
            /* Private Methods - splitQueryString() */
              function removeAmpersandEntityRefs(i)
              {
                if(splitString[ i ].indexOf( 'amp;' ) != -1 )
                splitString[ i ] = splitString[ i ].substring( 4, splitString[ i ].length );
              }
            /* Private Methods - splitQueryString() */
          }
        /* Private Methods - parseQueryString() */
      }
     
      function getArrayAsQueryString( aArrayToConvert )
      /*
        The function getArrayAsQueryString() takes in an associative array
        "aArrayToConvert" ( presumably one from "parseQueryString()" ), and
        returns a string appropriate for appending to a url ( i.e.
        "?name=Quincy&mathProblem=2%2B2%3D4" )
      */
      {
        sArrayToConvert = '?';
        for ( sAttributes in aArrayToConvert )
        {
          sArrayToConvert += sAttributes;
          sArrayToConvert += '=' + aArrayToConvert[ sAttributes ] + '&';
        }
        sArrayToConvert = sArrayToConvert.substring( 0, sArrayToConvert.length - 1 )
        return sArrayToConvert;
      }
/*////////////////////////////////////////////////////////////////////////////*/
/*/////////////////////////// PARSE QUERY STRING /////////////////////////////*/
/*////////////////////////////////////////////////////////////////////////////*/

var aValue = parseQueryString( "www.domain.com/file.nsf/Dummy?OpenForm&Type=A" );
alert( aValue[ "Type" ] )
var aValue = parseQueryString( "www.domain.com/file.nsf/Dummy?OpenForm&Type=B" );
alert( aValue.Type )
var aValue = parseQueryString( "www.domain.com/file.nsf/Dummy?OpenForm&Blah=1&La=1&Di=3&Type=Da" );
alert( aValue.La )

</script>