自学一个星期小白，已经无从下手，求大神帮改
程序代码：<html>
<head>
<style type="text/css">
td {text-align:center;background-color:#C0C0C0;}
input {text-align:center}
.biaoge { width:1800px;height:1000px;padding-top:60px;padding-left:130px;background-color:#989898;}
input:focus{background-color:#FFFFCC;}
</style>
<script type="text/javascript">
function IntValueCheck(input)
{
var value = input.value;
var result = true;
for (var i = 0; i< value.length; i++)
{
var vcar = value[i];
if ((vcar == "0")||(vcar == "1")||(vcar == "2")||(vcar == "3")||
(vcar == "4")||(vcar == "5")||(vcar == "6")||(vcar == "7")
||(vcar == "8")||(vcar == "9")||(vcar == "."))
{
}
else
{
alert("只允许输入整数字");
}
}
}
</script>
</head>
<body >
<div class="biaoge">
<table border="1" cellspacing="8" >
<tr>
<td><input id="number1" type="text" onblur="IntValueCheck(this);" /></td>
<td><input id="number2" type="text" size="10px" onblur="IntValueCheck(this);"/></td>
<td><input id="number3" type="text" readonly size="10px" /></td>
</tr>
</table>
</div>
</body>
</html>直接主题，我要number1×number2=number3 number1只可以整数，number2可以整数小数点，其他都报错，而且input填充颜色，number3无法选取，只输出数值，求打救，在线等，
