rem:  document.getElementById(currentFile).className = "passive"; 
add: if (currentFile != -1) document.getElementById(currentFile).className = "passive"; 
context: function fileClicked(fileId, shouldLoadFile){    if (shouldLoadFile === undefined) shouldLoadFile = true;        document.getElementById(currentFile).className = "passive";    document.getElementById(fileId).className = "active";    if (shouldLoadFile)         loadFile(fileId, false);}
meta: 5650	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/5650/b5c6da7b81cc29ad34e4bd00ce55ae86efaf134c/debugger.js/clean/WebKitTools/Drosera/debugger.js