function sea() {
	var bookname = document.search.bookname.value;

	if(bookname == "" ||bookname==null){
		alert("请输入要查找的商品名称...");
		return false;
	}
	return true;
}
function toggle(targetid){
    if (document.getElementById){
        target=document.getElementById(targetid);
            if (target.style.display=="block"){
                target.style.display="none";
            } else {
                target.style.display="block";
            }
    }
}
function pl_check()
{
			var tou = document.review.pltitle.value;
			tou = tou.replace(/(^\s*)|(\s*$)/g,"");
			var nei = document.review.pl.value;
			nei = nei.replace(/(^\s*)|(\s*$)/g,"");
			if(document.review.pltitle.value.length==0)
			{
				alert("请输入评论题目");
				document.review.pltitle.focus();
				return false;
			}
			if(tou.length==0){
				alert("评论题目不能为空");
				return false;
			}
			if(document.review.pltitle.value.length>20){
				alert("标题内容过长");
				return false;
			}
			if(nei.length==0){
				alert("评论内容不能为空");
				return false;
			}
			if(document.review.pl.value.length==0)
			{
				alert("请输入评论内容");
				document.review.pl.focus();
				return false;
			}
			if(document.review.pl.value.length>1000){
				alert("评论内容过长");
				return false;
			}
			return true;
}