var fDesc=new Array(); fDesc[0] = "Expression calculator xCalc evaluates expressions. You will enter the expressions just as they are. xCalc has several standard functions. Great circle calculations can be done on a sphere with Earth radius. Digit size can be adjusted (large or small). Variables can be used in expressions. Old statements can be scrolled back to editing and re-entered only with a single button. Statements are easy to enter and modify. And more."; 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 = ''; } }