function check_feedback(theform)
{
	if (jtrim(theform.name.value) == "")
	{
		alert("please fill name!");
		theform.name.focus();
		return false;
	}

	if (!isemail(theform.email.value)) {theform.email.focus();return false;}

	if (jtrim(theform.title.value) == "")
	{
		alert("please fill the feedback topic!");
		theform.title.focus();
		return false;
	}

	if (jtrim(theform.message.value) == "")
	{
		alert("please fill the remarks contents!");
		theform.message.focus();
		return false;
	}
	return true;
}

function check_leave(theform)
{
	if (theform.name.value == "")
	{
		alert("please enter your name！");
		theform.name.focus();
		return (false);
	}
	if (!isemail(theform.mail.value)) 
	{
		theform.mail.focus();
		return false;
	}
	if (theform.mess.value=="")
	{
		alert("please enter your message！");
		theform.mess.focus();
		return (false);
	}
	if (theform.code.value=="")
	{
		alert("please enter the code！");
		theform.code.focus();
		return (false);
	}
}

function check_regedit(theform)
{
	if (theform.user_no.value == "")
	{
		alert("please fill the member id!");
		theform.user_no.focus();
		return (false);
	}

	if (theform.user_password.value == "" || theform.user_password.value.length < 6 || theform.user_password.value.length > 12)
	{
		alert("please fill the password , the password length should 6-12 !");
		theform.user_password.focus();
		return (false);
	}

	if (theform.confirm_password.value == "")
	{
		alert("please fill the reenter password!");
		theform.confirm_password.focus();
		return (false);
	}
	
	if (theform.user_password.value != theform.confirm_password.value)
	{
		alert("two password inconformities!");
		theform.confirm_password.focus();
		return (false);
	}

	if (!isemail(theform.user_companyemail.value)) 
	{
		theform.user_companyemail.focus();
		return false;
	} 

}

function check_job(theform)
{
	if (jtrim(theform.name.value) == "")
	{
		alert("please fill in contact name！");
		theform.name.focus();
		return false;
    }

	if (jtrim(theform.sr.value) == "")
	{
		alert("please fill in the date of birth！");
		theform.sr.focus();
		return false;
    }

    if (jtrim(theform.tel.value) == "")
	{
		alert("please fill in contact phone！");
		theform.tel.focus();
		return false;
    }

    if (!isemail(theform.email.value)) 
	{
		theform.email.focus();
		return false;
	}

    if (jtrim(theform.lx.value) == "")
	{
		alert("please fill out the address！");
		theform.lx.focus();
		return false;
    }

	return true;
}

function check_stock(theform)
{
	if (jtrim(theform.contactperson.value) == "")
	{
		alert("please enter your name！");
		theform.contactperson.focus();
		return false;
	}
	if(!isemail(theform.email.value))
	{
		theform.email.focus();
		return false;
	}
	return true;
}

function check_product()
{
	for (var i=0;i<form8.elements.length;i++)
	{
		if(form8.elements[i].checked)
		{
			return true;
		}
	}
	alert("please select the products you want to add to the cart!");
	return false;
}

function checkall(form)  {
	for (var i=0; i<form.elements.length; i++)
	{
		var e = form.elements[i];
		if (e.name != 'chkall') e.checked = form.chkall.checked; 
	}
}

function isemail (s)
{
	if (s.length > 100)
	{
	window.alert("email address length can not be more than 100 !");
	return false;
	}
	var regu = "^(([0-9a-za-z]+)|([0-9a-za-z]+[_.0-9a-za-z-]*[0-9a-za-z]+))@([a-za-z0-9-]+[.])+([a-za-z]{2}|net|net|com|com|gov|gov|mil|mil|org|org|edu|edu|int|int)$"
	var re = new regexp(regu);
	if (s.search(re) != -1) {
		return true;
	} else {
		window.alert ("please enter a valid e-mail address ！")
		return false;
	}
}

function jtrim(str)
{
	var i = 0;
	var len = str.length;
	if ( str == "" ) return( str );
	j = len -1;
	flagbegin = true;
	flagend = true;
	while (flagbegin == true && i< len)
	{
		if (str.charat(i) == " " )
		{
			i=i+1;
			flagbegin=true;
		}
		else
		{
			flagbegin=false;
		}
	}

	while (flagend== true && j>=0)
	{
		if (str.charat(j)==" ")
		{
			j=j-1;
			flagend=true;
		}
		else
		{
			flagend=false;
		}
	}

	if ( i > j ) return ("")

	trimstr = str.substring(i,j+1);
	return trimstr;
}