<div id="show_amount" style="position:absolute;color:#DD0000;font-size:9pt;display:none;font-weight:bold;background-Color:#F4F4F4"></div>
<form name="frmregister" method="post">
<input type=hidden name="mprice_back" value="">
<input type='text' class=text_input name='ca_in_amount[]' value='' onkeypress='num_check(this);price(this);' onkeyup='num_check(this);price(this);' onblur='num_check(this);price(this);layer_out();' onfocus='num_check(this);price(this);layer_in();'>숫자를 입력 해 보세요~^^
</form>
<Script Language="JavaScript">
document.onmousemove = function() {
 document.getElementById('show_amount').style.pixelTop=event.y+document.body.scrollTop
 document.getElementById('show_amount').style.pixelLeft=event.x+document.body.scrollLeft+10
}
function layer_in() {
  document.getElementById('show_amount').style.display = '';
}
function layer_out() {
  document.getElementById('show_amount').style.display = 'none';
}
function price(f){
 var eokwon = Math.floor(f.value / 100000000);
 var manwon = Math.floor(f.value / 10000);
 var onewon = f.value % 10000;
 document.frmregister.mprice_back.value=f.value;
 var len = f.value.length;
 if (manwon == 0 && eokwon == 0) {
  if (len == 0)
   document.getElementById('show_amount').innerHTML ="";
  else
   document.getElementById('show_amount').innerHTML = onewon+"원";
 }
 else if (eokwon == 0) {
  if(onewon == '0') onewon = '';
  document.getElementById('show_amount').innerHTML = manwon+"만"+onewon+"원";
 }
 else {
  manwon = manwon % 10000;
  man_won = manwon + "만";
  if(manwon == '0') man_won = '';
  if(onewon == '0') onewon = '';
  document.getElementById('show_amount').innerHTML = eokwon + "억" + man_won + onewon + "원";
 }
}
function num_check(f) {
ins = f.value;
var pnumresult="";
    for (i=0; i<ins.length; i++) {
        charpnum = ins.substr(i,1);
        if (charpnum.charCodeAt(0) > 47 && charpnum.charCodeAt(0) < 58)
            pnumresult = pnumresult + charpnum;
    }
f.value = pnumresult;
if(ins == 0) f.value = '';
}
</script>

조 단위는 해당함수를 아래 함수로 변경 해주세요~

function price(f){
var joewon = Math.floor(f.value / 1000000000000);
var eokwon = Math.floor(f.value / 100000000);
var manwon = Math.floor(f.value / 10000);
var onewon = f.value % 10000;
document.frmregister.mprice_back.value=f.value;
var len = f.value.length;
if (manwon == 0 && eokwon == 0 && joewon == 0) {
  if (len == 0)
   document.getElementById('show_amount').innerHTML ="";
  else
   document.getElementById('show_amount').innerHTML = onewon+"원";
}
else if (eokwon == 0 && joewon == 0) {
  if(onewon == '0') onewon = '';
  document.getElementById('show_amount').innerHTML = manwon+"만"+onewon+"원";
}
else if (joewon == 0) {
  manwon = manwon % 10000;
  man_won = manwon + "만";
  if(manwon == '0') man_won = '';
  if(onewon == '0') onewon = '';
  document.getElementById('show_amount').innerHTML = eokwon + "억" + man_won + onewon + "원";
}
else {
  manwon = manwon % 10000;
  eokwon = eokwon % 10000;
  man_won = manwon + "만";
  eok_won = eokwon + "억";
  if(eokwon == '0') eok_won = '';
  if(manwon == '0') man_won = '';
  if(onewon == '0') onewon = '';
  document.getElementById('show_amount').innerHTML = joewon + "조" + eok_won + man_won + onewon + "원";
}
}

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