var fDesc=new Array(); fDesc[0] = "Speedstudy Pre-Calculus provides a solid educational foundation that will raise grades and test scores and improve math skills in the classroom and beyond. Using step-by-step animations, real-time quizzes and interactive examples, Speedstudy Pre-Calculus gives students the tools they will need to master key calculus concepts."; 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 = ''; } }