function _basicOperation (f,operation,mainId) {
	var location = "section="+f+"&operation="+operation;
	switch (f) {
		case 'basic' :
			switch (operation) {
				case 'main' : break;
				case 'sub'  : location += "&mainId="+mainId; break;
			} // end switch
		break;
	} // end switch
	return location;
} // end function