--Печать только цифр
 htp.p('function onlyNumber(){
          pF=event.srcElement;
          if (pF.value.length==0){return};
          var str=/^-?(\d{1,4})$/;
          var text=pF.value;
          if (!str.test(text)) {alert("Вводите только цифры!!!");  pF.value="";  pF.focus();}
 }');

<input name="a1" size=2 value="'||stb.an_1||'" maxlength=2 onKeyPress="onlyNumber(this);"  onFocus="setBlur('||i||');" >

for stb in (select t.*, t.rowid from tr_counts  t where substr(kod6,0,2)=nvl(sch,substr(kod6,0,2)) order by kod6, koda) loop
  
        htp.p('[SRC HTML]<tr><td>'||stb.kod6||'</td><td>'||stb.koda||'</td><td>'||stb.namea||'</td>
               <td><input name="a1" size=2 value="'||stb.an_1||'" maxlength=2 onKeyPress="onlyNumber(this);"  onFocus="setBlur('||i||');" ></td>
               <td><input name="a2" size=2 value="'||stb.an_2||'"  maxlength=2 onKeyPress="onlyNumber(this);"  onFocus="setBlur('||i||');" ></td>
               <td><input name="a3" size=2 value="'||stb.an_3||'" maxlength=2 onKeyPress="onlyNumber(this);" onFocus="setBlur('||i||');" ></td>
               <td><input id="change" type="checkbox" value="0" onClick="changed('||i||');" /><input type=hidden name="flag_change" value=0 /><input name="rown" type=hidden value="'||stb.rowid||'" /></td>

</table></form></body>

function onlyNumber(){
          pF=event.srcElement;
          if (pF.value.length==0){return};
          var str=/^-?(\d{1,4})$/;
          var text=pF.value;
          if (!str.test(text)) {alert("Вводите только цифры!!!");  pF.value="";  pF.focus();}

<input name="a1" size=2 value="'||stb.an_1||'" maxlength=2 onKeyPress="onlyNumber(this);"  onFocus="setBlur('||i||');" >
<input name="a2" size=2 value="'||stb.an_2||'"  maxlength=2 onKeyPress="onlyNumber(this);"  onFocus="setBlur('||i||');" >

<input type = "text" onKeyPress = "onlyNumber(this)">
  <script>
    function onlyNumber(){
          pF=event.srcElement;
          if (pF.value.length==0){return};
          var str=/^-?(\d{1,4})$/;
          var text=pF.value;
          if (!str.test(text)) {alert("Вводите только цифры!!!");}  pF.value="";  pF.focus();
		  }
  </script>

<script type="text/javascript">
function onlyNumber(evt) {
  var theEvent = evt || window.event;
  var key = theEvent.keyCode || theEvent.which;
  key = String.fromCharCode( key );
  var regex = /[0-9]|\./;
  if( !regex.test(key) ) {
    theEvent.returnValue = false;
    if(theEvent.preventDefault) theEvent.preventDefault();
  }
}

<input name="a1" size=2 value="'||stb.an_1||'" maxlength=2 onKeyPress="onlyNumber(event);"  onFocus="setBlur('||i||');" >