function submit_category(url,option_field)
{
	var optionOBJ;
	var selected_value;
	var URLstring;
	var URLid;
	
	//alert(option_field);
	
	//get selected activity id
	selected_value = option_field.options[option_field.selectedIndex].value;
	
	//alert(selected_value);
	
	if(selected_value != 0) {
		if(selected_value.search(/category/) != -1) {
			URLstring = "/cat/";
			URLid = selected_value.substr((selected_value.search(/_/) + 1));
			//alert('Match found at position: ' + selected_value.search(/category/));
		} else if (selected_value.search(/theme/) != -1){
			URLstring = "/theme/";
			URLid = selected_value.substr((selected_value.search(/_/) + 1));
			//alert('Match found at position: ' + selected_value.search(/theme/));
		}
		
		URLstring = URLstring + URLid;		
		//alert(URLstring);
		
		location.href= url + URLstring;		
	} else {
		return false;
	}	
	
}