// ====================================================================
//       Parsear querystring
// ====================================================================
function parseQueryString(queryString) {
  var queryObject = new Object();
  queryString = queryString.replace(/^.*\?(.+)$/,'$1');

  while ((pair = queryString.match(/([^=]+)=\'?([^\&\']*)\'?\&?/)) && pair[0].length) {
    queryString = queryString.substring( pair[0].length );

    if (/^\-?\d+$/.test(pair[2])) pair[2] = parseInt(pair[2]);
    queryObject[pair[1]] = pair[2];
  }

  return queryObject;
}

// ====================================================================
//       Abrir ventana
// ====================================================================
var v=null;
	function abrirURL(url) {
		if (v) v.close();
	  	v = window.open(url, 'v', "height=630,width=700,resizable=1,scrollbars=1");
	  	v.focus();
	  	return false;
	}	
	
	
// ====================================================================
//       URLEncode y URLDecode 
// ====================================================================
function URLEncode(cad)
{ 
	// The Javascript escape and unescape functions do not correspond
	// with what browsers actually do...
	var SAFECHARS = "0123456789" +					// Numeric
					"ABCDEFGHIJKLMNOPQRSTUVWXYZ" +	// Alphabetic
					"abcdefghijklmnopqrstuvwxyz" +
					"-_.!~*'()";					// RFC2396 Mark characters
	var HEX = "0123456789ABCDEF";

	var plaintext = cad;
	var encoded = "";
	for (var i = 0; i < plaintext.length; i++ ) {
		var ch = plaintext.charAt(i);
	    if (ch == " ") {
		    encoded += "+";				// x-www-urlencoded, rather than %20
		} else if (SAFECHARS.indexOf(ch) != -1) {
		    encoded += ch;
		} else {
		    var charCode = ch.charCodeAt(0);
			if (charCode > 255) {
			    alert( "Unicode Character '" 
                        + ch 
                        + "' cannot be encoded using standard URL encoding.\n" +
				          "(URL encoding only supports 8-bit characters.)\n" +
						  "A space (+) will be substituted." );
				encoded += "+";
			} else {
				encoded += "%";
				encoded += HEX.charAt((charCode >> 4) & 0xF);
				encoded += HEX.charAt(charCode & 0xF);
			}
		}
	} // for

	alert ("ddd->"+encoded);
	return encoded;
};

function URLDecode(cad)
{
	
   // Replace + with ' '
   // Replace %xx with equivalent character
   // Put [ERROR] in output if %xx is invalid.
   var HEXCHARS = "0123456789ABCDEFabcdef"; 
   var encoded = cad;
   var plaintext = "";
   var i = 0;
   while (i < encoded.length) {
       var ch = encoded.charAt(i);
	   if (ch == "+") {
	       plaintext += " ";
		   i++;
	   } else if (ch == "%") {
			if (i < (encoded.length-2) 
					&& HEXCHARS.indexOf(encoded.charAt(i+1)) != -1 
					&& HEXCHARS.indexOf(encoded.charAt(i+2)) != -1 ) {
				plaintext += unescape( encoded.substr(i,3) );
				i += 3;
			} else {
				alert( 'Bad escape combination near ...' + encoded.substr(i) );
				plaintext += "%[ERROR]";
				i++;
			}
		} else {
		   plaintext += ch;
		   i++;
		}
	} // while
   return plaintext;
   
};