var kat1=null;
var kat2=null;
var marka=null;


function bul()
	{
	var kok ="http://www.nealcan.com/asp/listgroup.asp?";
	var katogori;
	var aramayap;

	if(kat2 == null )
	{
	     katogori = kat1;
	}
	else 
	{
   		katogori = kat2;
  	}	
	
	if (marka == null)
	{
		aramayap = kok + "group=" + katogori;
	}
	else
	{
		aramayap = kok + "brand=" + marka + "&group=" + katogori;
	}
	window.location = aramayap;
	
}