// Class: PageQueryString
// Purpose: Allows simple access to key-value pairs stored in querystring
// Input: Value of querystring
function qs_PageQuery(qs)
{
	if(qs.length > 1) this.strQS = qs.substring(1, qs.length);
	else this.strQS = null;
	this.keyValuePairs = new Array();
	if(this.strQS)
	{
		for (var i=0; i < this.strQS.split("&").length; i++)
		{
			this.keyValuePairs[i] = this.strQS.split("&")[i];
		}
	}
	
	// Purpose: Getter
	this.getKeyValuePairs = function()
	{
		return this.keyValuePairs;
	}
	
	// Purpose: Returns value from querystring
	// Input: key (string)
	this.getValue = function(key) 
	{
		for(var j=0; j < this.keyValuePairs.length; j++) {
		if(this.keyValuePairs[j].split("=")[0] == key)
			return unescape(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; 
	} 
}

// Purpose: Shortcut function to returns value stored in querystring
// Remarks: qs_PageQuery object more efficient if checking multiple values
function qs_getQueryStringValue(key)
{
	var page = new qs_PageQuery(window.location.search); 
	return page.getValue(key); 
}