// Set up Event Listener - the script that allows us to use the addEvent call below

function addEvent(elm, evType, fn, useCapture) {
	if (elm.addEventListener) {
	elm.addEventListener(evType, fn, useCapture);
	return true;
	} else if (elm.attachEvent) {
	var r = elm.attachEvent('on' + evType, fn);
	return r;
	} else {
	elm['on' + evType] = fn;
	}
}

function getURLParam(strParamName){
  var strReturn = "";
  var strHref = window.location.href;
  if ( strHref.indexOf("&") > -1 ){
    var strQueryString = strHref.substr(strHref.indexOf("&")).toLowerCase();
    var aQueryString = strQueryString.split("&");
		//alert(aQueryString);
    for ( var iParam = 0; iParam < aQueryString.length; iParam++ ){
      if (aQueryString[iParam].indexOf(strParamName + "=") > -1 ){
        var aParam = aQueryString[iParam].split("=");
        strReturn = aParam[1];
        break;
      }
    }
  }
  return strReturn;
}

function setBkg() {
	var itemid = getURLParam("itemid");
	//alert(itemid);
	var nav = document.getElementById('navigation');
	var imagen = "1";
	switch(itemid){
		case "26":
		case "31":
		case "29":
		case "32":
			imagen = "2";
		break;
		case "63":
			imagen = "3";
		break;
		case "61":
		case "46":
			imagen = "4";
		break;	
		case "2":
			imagen = "5";
		break;		
		case "33":
		case "34":
		case "41":
		case "44":
		case "50":
			imagen = "10";
		break;			
		case "47":
			imagen = "6";
		break;
		case "48":
			imagen = "7";
		break;		
		case "22":
			imagen = "8";
		break;	
		case "51":
			imagen = "9";
		break;
	}
	nav.style.backgroundImage = 'url(templates/2cols/css/i/fondos_navigation/' + imagen + '.jpg)';
}



addEvent(window, 'load', setBkg, false);