function validate(form) { 
    if (form.name.value.length == 0) 
    { 
        alert("Please enter your name.") 
        form.name.focus() 
        return false 
    } 

    if (form.address.value.length == 0) 
    { 
        alert("Please enter your address.") 
        form.address.focus() 
        return false 
    } 

    if (form.zipcode.value.length == 0) 
    { 
        alert("Please enter your zipcode.") 
        form.zipcode.focus() 
        return false 
    } 

    if (form.city.value.length == 0) 
    { 
        alert("Please enter your city.") 
        form.city.focus() 
        return false 
    }

    if (form.email.value.length == 0) 
    { 
        alert("Please enter your email address.") 
        form.email.focus() 
        return false 
    } 

    if (form.email.value.indexOf("@") == -1) 
    { 
        alert("Please enter a valid email address."); 
        form.email.focus(); 
        return false; 
    }

    if (form.information.value.length == 0) 
    { 
        alert("Please enter your medical history and other information.") 
        form.information.focus() 
        return false 
    }
}