function isEmail( email){

    var pass;
    
    if( email.indexOf('@') < 3 || email.length - email.indexOf('@') < 6 || email.indexOf('.') < 3 || email.length - email.indexOf('.') < 3){
        
        pass = false;
        
    }
    
    else{
    
        pass = true;
    
    }    
   
    return pass;     

}