<style>input{border:0px;height:25px;line-height:25px;}

.alipay{margin:20px auto;width:300px;border:1px solid #ccc;font-size:12px;}

.alipay ul{margin:0px;padding:0px;}

.alipay li{list-style-type:none;clear:both; overflow:hidden;}

.alipay li p{float:left;text-indent:0!important;padding:0px;margin:0px;width:60px;text-align:center;border-right:1px solid #ccc;}

.alipay li span{margin-left:5px;}

.bb{border-bottom:1px solid #ccc;height:30px;line-height:30px;}

.paybg{background:#ddd;}

.pay{text-align:center;}.pay input{background:#ccc;color:#FFF;height:30px;line-height:30px;border-radius:3px;margin:5px auto; font-weight:bold;}

.pay input:hover{background:#FC3;}

</style>

<form name="alipayment" accept-charset="GBK" method="post" action="https://shenghuo.alipay.com/send/payment/fill.htm" target="_blank" onSubmit="return CheckForm();">

<div class="alipay"><ul>

<li class="bb paybg"><p>付款帐号</p><span><input type="hidden" name="optEmail" value="支付宝帐号" />支付宝帐号</span></li>

<li class="bb"><p>付款金额</p><span><input type="text" id="s" class="form-control" name="payAmount" value=""  placeholder="金额必须填写"/></span></li>

<li class="bb"><p>备注说明</p><span><input type="text" name="title" value="" placeholder="可以是邮箱或QQ..."/></span></li>

<li class="pay"><input type="submit" id="searchsubmit" value="登录支付宝付款" /></li>

</ul></div></form>

<script language=JavaScript>

function CheckForm(){

if(document.alipayment.payAmount.value.length == 0){alert("请输入付款金额.");document.alipayment.payAmount.focus();return false;}

var reg	= new RegExp(/^\d*\.?\d{0,2}$/);

if(! reg.test(document.alipayment.payAmount.value)){alert("金额必须是数字");document.alipayment.payAmount.focus();return false;}

if(Number(document.alipayment.payAmount.value) < 1.00){alert("付款金额金额最小是1.00.");document.alipayment.payAmount.focus();return false;	}  

}  

</script>