function UrlBuilder(url)
{
	this.m_Href = url;
	this.m_Host = null;
	this.m_Hostname = null; 
	this.m_Port = null;
	this.m_Protocol = null;
	this.m_Path = null;
	this.m_Search = null;
	this.m_Hash = null;
	this.m_Params = null; 
	this.Parse(url);

	this.toString = function()
	{
		return '[class UrlBuilder]';
	};
}

UrlBuilder.prototype.Parse = function(url)
{
	var m = url.match(/(\w{3,5}:)\/\/([^\.]+(?:\.[^\.:/]+)+)(?::(\d{1,5}))?\/?/);
	if ( m )
	{
		this.m_Protocol = m[1];
		this.m_Hostname = m[2]; 
		this.m_Port = m[3]; 
		if ( this.m_Port ) 
		{
			this.m_Host = this.m_Hostname + ':' + this.m_Port;
		}
		else
		{
			this.m_Host = m[2];
		}
		var indexHash = url.indexOf('#');
		if ( indexHash != -1 )
		{
			this.m_Hash = url.substr(indexHash);
		}
		else
		{
			this.m_Hash = '';
		}
		var indexParams = url.indexOf('?');
		if ( indexParams != -1 )
		{
			if ( indexHash != -1 )
			{
				this.m_Search = url.substring(indexParams, indexHash);
			}
			else
			{
				this.m_Search = url.substr(indexParams);
			}
			this.m_Path = url.substr(indexParams);
		}
		else
		{
			this.m_Search = '';
		}
		this.m_Success = true; 
		this.m_Params = null; 
		this.m_Href = url;
	}
};

UrlBuilder.prototype.GetValue = function(key, encoding)
{
	if ( !this.m_Params )
	{
		if ( this.m_Search )
		{
			this.m_Params = {}; 
			var search = this.m_Search.substring(1);
			var keyValues = search.split('&');
			for ( var i=0 ; i < keyValues.length ; ++i )
			{
				var keyValue = keyValues[i];
				var index = keyValue.indexOf('=');
				if ( index != -1 )
				{
					this.m_Params[keyValue.substring(0, index)] = keyValue.substr(index+1);
				}
				else
				{
					this.m_Params[keyValue] = '';
				}
			}
		}
	}
	encoding = encoding || ''; 
	switch(encoding.toUpperCase())
	{
		case 'UTF8' :
		{
			return decodeURI(this.m_Params[key]);
		}
		case 'UNICODE' :
		{
			return unescape(this.m_Params[key]);
		}
		case 'GB2312' : // need VBScript function Chr()
		default :
		{
			return this.m_Params[key];
		}
	}
}

function HighlightText(range)
{
	if ( range )
	{
		this.m_Range = range;
	}
	else
	{
		this.m_Range = document.body.createTextRange();
	}
	this.m_Keyword = '';

	this.toString = function()
	{
		return '[class HightlightText]';
	};
}

HighlightText.prototype.Execute = function(keyword)
{
	if ( keyword )
	{
		this.m_Keyword = keyword;
	}
	if ( this.m_Range && this.m_Keyword )
	{
		var separater = ' ';
		if ( this.m_Keyword.indexOf(' ') == -1 ) 
		{
			separater = '+';
		}
		var keywords = this.m_Keyword.split(separater); 
		var bookmark = this.m_Range.getBookmark();
		for ( var i=0 ; i < keywords.length ; ++i )
		{
			var keyword = keywords[i];
			if ( keyword && keyword.length > 1 )
			{
				while(this.m_Range.findText(keywords[i]))
				{
					this.m_Range.execCommand('ForeColor', 'false', 'highlighttext');
					this.m_Range.execCommand('BackColor', 'false', 'highlight'); 
					this.m_Range.collapse(false);
				}
				this.m_Range.moveToBookmark(bookmark);
			}
		}
	}
}


function FriendlyDisplayForSearch()
{
	var url = new UrlBuilder(document.referrer);
	if ( url.m_Success )
	{
		var href = url.m_Href.toLowerCase();
		if ( href.indexOf('result.aspx') != -1 )
		{
			var keywords = url.GetValue('Key', 'UTF8');
			//alert(url);
			if ( keywords )
			{
				var ht = new HighlightText();
				ht.Execute(keywords);
			}
		}
	}
}