var fDesc=new Array(); fDesc[0] = "Pintar InterACTIVE VirtuaLab Optics lets you test your theories or hypotheses on light and vision. You may arrange lenses in various configurations, pass light through lenses, and prisms and plane mirrors with or without filters, as well as reflect or refract light to perform optical functions."; 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 = ''; } }