HTML Calculator:gcufbioinfo

paste this code to your source code of your calculator in head part
function sqrt(form)
 {
form.displayvalue.value=Math.sqrt(form.displayvalue.value);
 }
function sq(form)
 {
form.displayvalue.value=eval(form.displayvalue.value)*eval(form.displayvalue.value);
 }
function ln(form)
 {
form.displayvalue.value=Math.exp(form.displayvalue.value);
 }
function equal(form)
 {
form.displayvalue.value=eval(form.displayvalue.value);
 }
function delChar(input)
 {
input.value=input.value.substring(0,input.value-length-1);
 }
function addChar(input,character)
 {
if(input.value==null||input.value=="0")
      input.value=character
else
      input.value+=character
 }
Insha Allah you will see your functioning very soon regards Admin Quratt ul ain Siddique.