if (document.layers) { 

document.write("<input type='image' src='images/but_track.gif' border='0'");

document.write(" onclick='ValTrackingEng(ftracking);' onMouseOut='MM_swapImgRestore()'");

document.write(" onMouseOver='MM_swapImage(\"track\",\"\",\"images/but_track_f2.gif\",1)'>");

} else {

document.write("<a href='javascript:ValTrackingEng(ftracking)' onMouseOut='MM_swapImgRestore()'");

document.write(" onMouseOver='MM_swapImage(\"track\",\"\",\"images/but_track_f2.gif\",1)'>");

document.write("<img name='track' border='0' src='images/but_track.gif'></a>");

}