var fDesc=new Array(); fDesc[0] = "Feature:

- Explanations of principles of basic algebra (350 instructional items).
- Step-by-step sample problems that the student can consult later.
- Practice problems randomly generated until student shows mastery.
- All solutions are entered step-by-step.
- All legitimate solution methods supported.
- Any incorrect step is flagged as soon as it is typed.
- A hint or suggested next step can always be requested.
- Intelligent help at every step, including instant prerequisite review.
- Solution strategy changes intelligently in response to the student's steps.
- 700 practice problem forms generating 100,000 distinct problems."; 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 = ''; } }