$(document).ready(function() {
  $('#content_mainNav a').click(function() {
										
    $("#content_overview").html("    <img src='images/loading.gif' /><p>.... loading</p>").fadeIn('slow');										
										
     var urltoload = 't_advice_info_load.php' + this.id;	
	 
      $(this).fadeOut('slow', function(){
		$('#content_mainNav a').removeClass("selected")	
		$(this).fadeIn('slow');
		 $(this).addClass("selected")
		    $("#content_overview").slideDown('slow');
		load_todiv("#content_overview", urltoload);
		
return false; 
      });
	
  });						   
// return false to prevent normal browser submit and page navigation 
return false; 
});





function load_todiv(divtoload, url){
    //$("#div_gallery_box").html("    <img src='js/thickbox/loadingAnimation.gif' />.... loading").fadeIn('slow');	
    $(divtoload).load(url);	

}



jQuery.extend({

/**
* Returns get parameters.
*
* If the desired param does not exist, null will be returned
*
* @example value = $.getURLParam("paramName");
*/ 
 getURLParam: function(strParamName){
	  var strReturn = "";
	  var strHref = window.location.href;
	  var bFound=false;
	  
	  var cmpstring = strParamName + "=";
	  var cmplen = cmpstring.length;

	  if ( strHref.indexOf("?") > -1 ){
	    var strQueryString = strHref.substr(strHref.indexOf("?")+1);
	    var aQueryString = strQueryString.split("&");
	    for ( var iParam = 0; iParam < aQueryString.length; iParam++ ){
	      if (aQueryString[iParam].substr(0,cmplen)==cmpstring){
	        var aParam = aQueryString[iParam].split("=");
	        strReturn = aParam[1];
	        bFound=true;
	        break;
	      }
	      
	    }
	  }
	  if (bFound==false) return null;
	  return strReturn;
	}
});