contact_script.js

function validateForm(){ 
    var name = document.forms["myForm"]["name"];               
    var email = document.forms["myForm"]["email"];    
    var message = document.forms["myForm"]["message"];   

    if (name.value == "")                                  
    { 
        document.getElementById('errorname').innerHTML="Please enter a valid name";  
        name.focus(); 
        return false; 
    }else{
        document.getElementById('errorname').innerHTML="";  
    }
    
    if (email.value == "")                                   
    { 
        document.getElementById('erroremail').innerHTML="Please enter a valid email address"; 
        email.focus(); 
        return false; 
    }else{
        document.getElementById('erroremail').innerHTML="";  
    }

    if (email.value.indexOf("@", 0) < 0)                 
    { 
        document.getElementById('erroremail').innerHTML="Please enter a valid email address"; 
        email.focus(); 
        return false; 
    } 

    if (email.value.indexOf(".", 0) < 0)                 
    { 
        document.getElementById('erroremail').innerHTML="Please enter a valid email address"; 
        email.focus(); 
        return false; 
    } 

    if (message.value == "")                           
    {
        document.getElementById('errormsg').innerHTML="Please enter a valid message"; 
        message.focus(); 
        return false; 
    }else{
        document.getElementById('errormsg').innerHTML="";  
    }
    
    return true;
}