javascript驗證e-mail

Html代碼 
<html> 
    <head> 
        <script type=”text/javascript”> 
            function validate_email(field,alerttxt)  
            {  
                with (field)  
                {  
                    apos=value.indexOf(“@”)  
                    dotpos=value.lastIndexOf(“.”)  
                    if (apos<1||dotpos-apos<2)   
                    {alert(alerttxt);return false}  
                    else {return true}  
                }  
            }  
 
            function validate_form(thisform)  
            {  
                with (thisform)  
                {  
                    if (validate_email(email,”Not a valid e-mail address!”)==false)  
                    {email.focus();return false}  
                }  
            }  
        </script> 
    </head> 
 
    <body> 
        <form action=”submitpage.htm”onsubmit=”return validate_form(this);” method=”post”> 
            Email: <input type=”text” name=”email” size=”30″> 
            <input type=”submit” value=”Submit”>   
        </form> 
    </body> 
 
</html> 

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