rem: lineid.style.backgroundColor = ''; 
add: if (lineid) { lineid.style.backgroundColor = '' }; 
context: function dq_update_deps(snmp_query_id, num_columns) {	dq_reset_deps(snmp_query_id, num_columns);		dropdown = document.getElementById('sgg_' + snmp_query_id);	var snmp_query_graph_id = dropdown.value		for (var i = 0; i < created_graphs[snmp_query_graph_id].length; i++) {		for (var j = 0; j < num_columns; j++) {			lineid = document.getElementById('text' + snmp_query_id + '_' + created_graphs[snmp_query_graph_id][i] + '_' + j);			lineid.style.color = '999999';		}				chkbx = document.getElementById('sg_' + snmp_query_id + '_' + created_graphs[snmp_query_graph_id][i]);		chkbx.style.visibility = 'hidden';		chkbx.checked = false;				lineid = document.getElementById('line' + snmp_query_id + '_' + created_graphs[snmp_query_graph_id][i]);		lineid.style.backgroundColor = '';	}}
meta: 412	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/412/c3229ca4fb70dfb7feed6e84d28ae344a8ad94ad/layout.js/buggy/include/layout.js