function show_sub_category(str, path)
{
	if (str.length==0)
	{
		document.getElementById("sub_category").innerHTML="";
		return;
	}
	if (window.XMLHttpRequest)
	{// code for IE7+, Firefox, Chrome, Opera, Safari
		xmlhttp=new XMLHttpRequest();
	}
	else
	{// code for IE6, IE5
		xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
	}
		xmlhttp.onreadystatechange=function()
	{
	if(xmlhttp.readyState==4 && xmlhttp.status==200)
	{
		document.getElementById("sub_category").innerHTML=xmlhttp.responseText;
	}
	}
xmlhttp.open("GET", path+"?q="+str,true);
xmlhttp.send();
}