var fDesc=new Array(); fDesc[0] = "Pintar Physics Lesson Pack - Electromagnetism Lite Version is a suite of lessons and teaching resources that covers the concepts of electromagnetism. You can learn about the power of magnetic fields (both natural and created), the relationship between electromagnetism and electricity, and how motors, generators and transformers work."; 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 = ''; } }