var fDesc=new Array(); fDesc[0] = "This free educational utility is a 2d boundary element method field solver. It allows you to view the equipotential lines around a transmission line. By seeing where the lines are densest you can view the areas of strongest field and better understand which areas of a structure have a greater effect on impedance."; 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 = ''; } }