javascript - non repeating number from a range and submitting from a form to a page -

can please please?

i'm needing select non repeated random number range of 1 - 80 not repeat it. rather form getting range user wish define in java script , @ press of submit button generates non repeated number in range of 1 - 80 in text area form submit, clear , result text area.

here form code:

<form name="generate"> <table>     <tr>       <td colspan="2"><input type="button" name="send_it" value="enter" onclick="chooserandom(this.form)">&nbsp; &nbsp; <input type="reset" value="clear" onclick="clearform(this.form)"><br />       <br />       </td>     </tr>     <tr>       <td>random number:&nbsp;</td>       <td><input type="text" name="result" size="5"></td>     </tr>   </table> </form> 

here java script:

<script type="text/javascript">  function chooserandom(form) {  var m = parseint(form.lower.value);  var n = parseint(form.upper.value) - m;  var output = math.floor(math.random() * n) + m;         if (m < 0) {             alert('enter # greater 0');         }         if (n > 79) {             alert('enter # less 80');         }  form.result.value = output;  } // clears form  function clearform(form) {      form.upper.value="";      form.lower.value="";      form.upper.focus();      form.upper.select();  } </script> 

any grateful. tyvy jared moore

hopefully wanted :) new @ answering questions here.

var rand = [];  for(var = 1;i<=80;i++){     rand.push(i); } function getrand(){     var index = math.floor(math.random()*rand.length)     return rand.splice(index,1) }