/**
 * @author Alexander Farkas
 * v. 1.02
 */

(function($) {
	$.extend($.fx.step,{
		backgroundPosition: function(fx) {
			if (fx.state === 0 && typeof fx.end == 'string') {
				var start = $.curCSS(fx.elem,'backgroundPosition');
				start = toArray(start);
				fx.start = [start[0],start[2]];
				var end = toArray(fx.end);
				fx.end = [end[0],end[2]];
				fx.unit = [end[1],end[3]];
			}
			var nowPosX = [];
			nowPosX[0] = ((fx.end[0] - fx.start[0]) * fx.pos) + fx.start[0] + fx.unit[0];
			nowPosX[1] = ((fx.end[1] - fx.start[1]) * fx.pos) + fx.start[1] + fx.unit[1];
			fx.elem.style.backgroundPosition = nowPosX[0]+' '+nowPosX[1];
				
			function toArray(strg){
				strg = strg.replace(/left|top/g,'0px');
				strg = strg.replace(/right|bottom/g,'100%');
				strg = strg.replace(/([0-9\.]+)(\s|\)|$)/g,"$1px$2");
				var res = strg.match(/(-?[0-9\.]+)(px|\%|em|pt)\s(-?[0-9\.]+)(px|\%|em|pt)/);
				return [parseFloat(res[1],10),res[2],parseFloat(res[3],10),res[4]];
			}
		}
	});
})(jQuery);


jQuery.fn.extend({
/**
* Returns get parameters.
*
* If the desired param does not exist, null will be returned
*
* To get the document params:
* @example value = $(document).getUrlParam("paramName");
* 
* To get the params of a html-attribut (uses src attribute)
* @example value = $('#imgLink').getUrlParam("paramName");
*/ 
 getUrlParam: function(strParamName){
	  strParamName = escape(unescape(strParamName));
	  
	  var returnVal = new Array();
	  var qString = null;
	  
	  if ($(this).attr("nodeName")=="#document") {
	  	//document-handler
		
		if (window.location.search.search(strParamName) > -1 ){
			
			qString = window.location.search.substr(1,window.location.search.length).split("&");
		}
			
	  } else if ($(this).attr("src")!="undefined") {
	  	
	  	var strHref = $(this).attr("src")
	  	if ( strHref.indexOf("?") > -1 ){
	    	var strQueryString = strHref.substr(strHref.indexOf("?")+1);
	  		qString = strQueryString.split("&");
	  	}
	  } else if ($(this).attr("href")!="undefined") {
	  	
	  	var strHref = $(this).attr("href")
	  	if ( strHref.indexOf("?") > -1 ){
	    	var strQueryString = strHref.substr(strHref.indexOf("?")+1);
	  		qString = strQueryString.split("&");
	  	}
	  } else {
	  	return null;
	  }
	  	
	  
	  if (qString==null) return null;
	  
	  
	  for (var i=0;i<qString.length; i++){
			if (escape(unescape(qString[i].split("=")[0])) == strParamName){
				returnVal.push(qString[i].split("=")[1]);
			}
			
	  }
	  
	  
	  if (returnVal.length==0) return null;
	  else if (returnVal.length==1) return returnVal[0];
	  else return returnVal;
	}
});