javascript控制text只能输入数字（整数，小数），兼容ie,ff,safari【转载】

http://hi.baidu.com/aaxh/blog/item/804b2ef5d22e2a27bd310951.html
<SCRIPT LANGUAGE="JavaScript">
<!--
var isIE = false;
var isFF = false;
var isSa = false;

if ((navigator.userAgent.indexOf("MSIE")>0) && (parseInt(navigator.appVersion) >=4))isIE = true;
if(navigator.userAgent.indexOf("Firefox")>0)isFF = true;
if(navigator.userAgent.indexOf("Safari")>0)isSa = true;

function onlyNumber(e)
{
    var key;
    iKeyCode = window.event?e.keyCode:e.which;
    if( !(((iKeyCode >= 48) && (iKeyCode <= 57)) || (iKeyCode == 13) || (iKeyCode == 46) || (iKeyCode == 45) || (iKeyCode == 37) || (iKeyCode == 39) || (iKeyCode == 8)))
    {   
        if (isIE)
        {
            e.returnValue=false;
        }
        else
        {
            e.preventDefault();
        }
    }
}
//-->
</SCRIPT>
<input type="text" onkeypress="return onlyNumber(event)">

另外一个：
=====================
<input type="text" onKeyUp="this.value=this.value.replace(/[^\.\d]/g,'');if(this.value.split('.').length>2){this.value=this.value.split('.')[0]+'.'+this.value.split('.')[1]}">