function getCategorySelectionParameters(action) {
	var categoryParameters = action;
	if(window.getMainCategoryIdParameter) {
		categoryParameters = categoryParameters +
			"?mainCategoryId=" + getMainCategoryIdParameter();
			
		if(window.getSubCategoryIdParameter) {
			categoryParameters = categoryParameters +
				"&subCategoryId=" + getSubCategoryIdParameter();
		} 
	}
	
	return categoryParameters;
}