function PageQuery(q) 
{
	if(q.length > 1) 
	{
		this.q = q.substring(1, q.length);
	}
	else 
	{
		this.q = null;
	}
    
	this.keyValuePairs = new Array();
    
	if(q) 
	{
		for( var i=0; i < this.q.split("&").length; i++) 
		{
			this.keyValuePairs[i] = this.q.split("&")[i];
		}
	}
    
	this.getKeyValuePairs = function() 
	{ 
		return this.keyValuePairs; 
	}

	this.getValue = function(s) 
	{
		for(var j=0; j < this.keyValuePairs.length; j++) 
		{
			if(this.keyValuePairs[j].split("=")[0] == s)
			{
				return this.keyValuePairs[j].split("=")[1];
			}
		}
        
		return null;
	}

	this.getParameters = function() 
	{
		var a = new Array(this.getLength());
		for(var j=0; j < this.keyValuePairs.length; j++) 
		{
			a[j] = this.keyValuePairs[j].split("=")[0];
		}
        
		return a;
	}

	this.getLength = function() 
	{ 
		return this.keyValuePairs.length; 
	} 
}

var page = null; 

function queryString(key)
{
	if(!page)
	{
		page = new PageQuery(window.location.search); 
	}
    
	if(page && page.getValue(key))
	{
		return unescape(page.getValue(key)); 
	}
    
	return null;
}