function Left(str, n){ if (n <= 0) return ""; else if (n > String(str).length)
	    return str; else return String(str).substring(0,n); }
function Right(str, n){ if (n <= 0) return ""; else if (n > String(str).length)
       return str; else { var iLen = String(str).length; return String(str).substring(iLen, iLen - n); } }
function InStr(n, s1, s2){ var numargs=InStr.arguments.length; 	
	if(numargs<3) return n.indexOf(s1)+1; else return s1.indexOf(s2, n)+1; }

function SoloArgs() { 
 query=''+ this.location; 
 posicion = 1; posicion = query.indexOf('?'); return posicion;
}
function URLFull() {query=''+ this.location; return query;}

function changeURLarg(elemento, valor) {
  query = '' + this.location;
  posicion = Instr(query,'?');
  
  qu = query
  query = query.substring((query.indexOf('?')) + 1);
    // Keep everything after the question mark '?'.
  if (query.length < 1) { return false; }  // Perhaps we got some bad data?
  keypairs = new Object();
  numKP = 1;
    // Local vars used to store and keep track of name/value pairs
    // as we parse them back into a usable form.
  while (query.indexOf('&') > -1) {
    keypairs[numKP] = query.substring(0,query.indexOf('&'));
    query = query.substring((query.indexOf('&')) + 1);
    numKP++;
      // Split the query string at each '&', storing the left-hand side
      // of the split in a new keypairs[] holder, and chopping the query
      // so that it gets the value of the right-hand string.
  }
  keypairs[numKP] = query;
    // Store what's left in the query string as the final keypairs[] data.<
  for (i in keypairs) {
    keyName = keypairs[i].substring(0,keypairs[i].indexOf('='));
      // Left of '=' is name.
    keyValue = keypairs[i].substring((keypairs[i].indexOf('=')) + 1);
      // Right of '=' is value.
    while (keyValue.indexOf('+') > -1) {
      keyValue = keyValue.substring(0,keyValue.indexOf('+')) + ' ' + keyValue.substring(keyValue.indexOf('+') + 1);
        // Replace each '+' in data string with a space.
    }
    keyValue = unescape(keyValue);
      // Unescape non-alphanumerics
    if (FORM_DATA[keyName]) {
      FORM_DATA[keyName] = FORM_DATA[keyName] + separator + keyValue;
        // Object already exists, it is probably a multi-select input,
        // and we need to generate a separator-delimited string
        // by appending to what we already have stored.
    } else {
      FORM_DATA[keyName] = keyValue;
        // Normal case: name gets value.
    }
  }
  return FORM_DATA;
  }

function createCookie(name,value,days) {
	if (days) {
		var date = new Date();
		date.setTime(date.getTime()+(days*24*60*60*1000));
		var expires = "; expires="+date.toGMTString();
	}
	else var expires = "";
	document.cookie = name+"="+value+expires+"; path=/";
}

function readCookie(name) {
	var nameEQ = name + "=";
	var ca = document.cookie.split(';');
	for(var i=0;i < ca.length;i++) {
		var c = ca[i];
		while (c.charAt(0)==' ') c = c.substring(1,c.length);
		if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
	}
	return null;
}

function getURLParam(strParamName){
  var strReturn = "";
  var strHref = window.location.href;
  if ( strHref.indexOf("?") > -1 ){
    var strQueryString = strHref.substr(strHref.indexOf("?")).toLowerCase();
    var aQueryString = strQueryString.split("&");
    for ( var iParam = 0; iParam < aQueryString.length; iParam++ ){
      if (
aQueryString[iParam].indexOf(strParamName + "=") > -1 ){
        var aParam = aQueryString[iParam].split("=");
        strReturn = aParam[1];
        break;
      }
    }
  }
  return strReturn;
}