var ifrname=randomIframe();

function isEmail(emailStr){
	if(emailStr.length<5) return false;
	if ((emailStr.indexOf('@', 0)<1) || emailStr.indexOf('.') == -1) return false
	else	return true
}
function randomIframe()
{
	var iframe="hiddenifr_"+Math.floor(Math.random()*1000);
	document.write("<iframe frameborder=0 scrolling=no width=0 height=0 style='display:none' name='"+iframe+"' id='"+iframe+"'></iframe>");
	return iframe;
}

function recheck(form,bool)
{
	if(form.UserName.value=="")
	{
		alert("please input name");
		form.UserName.focus();
		return false;
	}
	if(isEmail(form.UserMail.value)=="")
	{
		alert("please input email");
		form.UserMail.focus();
		return false;
	}
	if(form.Comments.value=="")
	{
		alert("please input Content");
		form.Comments.focus();
		return false;
	}
	if(form.Comments.value.length>1000)
	{
		alert("Comments limit size < 1000");
		form.Comments.focus();
		return false;
	}
	if(form.yz.value=="")
	{
		alert("please input Security Word");
		form.yz.focus();
		return false;
	}
	form.method="post";
	form.target=ifrname;
	form.action="gb_save.asp";
	form.submit();
	return true;
}

function resetForm()
{
	var randImg=document.getElementById("randImg");
	randImg.src="../admin/inc/randomImg.asp?rnd="+Math.random();
}