var fDesc=new Array(); fDesc[0] = "DirectMath is a front end for the Mathematica and Maxima computer algebra systems. DirectMath uses a powerful built-in pattern matching system to anticipate the computations you want to do, making it possible for you to perform a wide range of operations without having to learn a specialized programming language."; function tShowHide(id, show) { var s = document.getElementById("desc"); if ((s.innerHTML.length<=212 || show==1) && show!=2) { s.innerHTML = fDesc[id]; if (document.getElementById('m1')) document.getElementById('m1').style.display='none'; if (document.getElementById('m2')) document.getElementById('m2').style.display='none'; if (document.getElementById('more_txt')) document.getElementById('more_txt').style.display='inline'; } else { s.innerHTML = ''; } }