function addRow(num, id){
	var currrow = $_('row_'+num);
	
	var count = parseInt($_('count').value);
	var newcount = count+1;
	
	var newrow = document.createElement('tr');
	newrow.id= 'row_' + newcount;
	$_('house').insertBefore(newrow, currrow.nextSibling);

}

Error: uncaught exception: [Exception... "Node was not found"  code: "8" nsresult: "0x80530008 (NS_ERROR_DOM_NOT_FOUND_ERR)"  location: "http://app.mclarengrading.com/includes/js/daily_log_functions.js Line: 26"]