iHTML 的 form 提交之前如何验证数值文本框的内容全部为数字

<input type="text" id="d1" onblur=" chkNumber (this)"/>

<script type=”text/javascript” />

function chkNumber(eleText)

{

var value = eleText.value;

var len = value.length;

for(var i=0;i<len;i++)

{

if(value.charAt(i)>"9" || value.charAt(i)<"0")

{

alert("含有非数字字符");

eleText.focus();

break;

}

}

}

</script>