<SCRIPT language=JavaScript>
function IsNum(theField)
{
if (!IsNum2(theField.value))
{alert("该区域只能输入数字！");
theField.value ="";
theField.focus();}
}
function IsNum2(s)
{
var Number = "0123456789.";
for (i = 0; i < s.length;i++)
{
// Check that current character isn't whitespace.
var c = s.charAt(i);
if (Number.indexOf(c) == -1) return false;
}
return true
}
</script>
<input name=a123 type=text onblur=IsNum(this)>
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