$.extend({
  getUrlVars: function(url){
    var vars = [], hash;
    var hashes;
    if(url == null || url == ''){
    	hashes = window.location.href.slice(window.location.href.indexOf('?') + 1).split('&');
    }else{
    	hashes = url.slice(url.indexOf('?') + 1).split('&');
    }	
    
    for(var i = 0; i < hashes.length; i++)
    {
      hash = hashes[i].split('=');
      if(vars[hash[0]] === undefined ){
    	vars.push(hash[0]);
      	vars[hash[0]] = hash[1];
      }
    }
    return vars;
  },
  getUrlVar: function(url, name){
    return $.getUrlVars(url)[name];
  },
  setUrlVar: function(url, name, value){
	oldValue = $.getUrlVar(url, name);
	if(oldValue != null && oldValue != ''){
		url = url.replace(oldValue, value);
	}else{
		index = url.indexOf(name);
		if(index > -1){
			url = url.substring(0,index+value.length+1)+value+url.substring(index+value.length+1);
		}else{
			if((url.indexOf('#') == url.length-1)){
				url = url.substring(0, url.length-1);
			}
			if(url.indexOf('?') >-1){
				url = url+'&'+name+'='+value;
			}else{
				url = url+'?'+name+'='+value;
			}
		}
	}	
	return url;
  }
});