var email = /^[a-zA-Z]{1}([a-zA-Z0-9]?[\.\-\_]{0,1}[a-zA-Z0-9]+)*[@]{1}(([a-zA-Z0-9]+[\.]{1})+([a-zA-Z]+))$/;

var password = /^[a-zA-Z0-9_]+$/;

var username = /^[a-zA-Z0-9_ ]+$/;

var numeric = /^[0-9]+$/;

var city = /^[a-zA-Z]+$/;



function feed_user1()
{
     if(document.getElementById('username1').value == '');
     else
     {
         if(!document.getElementById('username1').value.match(username))
         {
              alert('Invalid user name:  Only alphabet and underscore are allowed.');
              document.getElementById('username1').value="";
         }
     }
}


function feed_email()
{
    if(document.getElementById('email1').value == '');
    else
    {
        //validation for email
        if(!document.getElementById('email1').value.match(email))
        {
            alert('Please enter valid email adress.');
            document.getElementById('email1').value='';
        }
    }
}


function feed_query1()
{

  if(document.getElementById('feedbackform').value == '');
     else
    {
        if(!document.getElementById('feedbackform').value.match(username))
        {
              alert('Invalid user name:  Only alphabet and underscore are allowed.');
             document.getElementById('feedbackform').value="";
         }
     }


}

// function feed_location()
//{
//     if(document.getElementById('location_support').value == '');
//     else
//     {
//         if(!document.getElementById('location_support').value.match(username))
//         {
//              alert('Invalid user name:  Only alphabet and underscore are allowed.');
//              document.getElementById('location_support').value="";
//         }
//     }
//}



function feed_mobile()
{
    if(document.getElementById('mobile1').value == '');
    else
    {
        //validation for email
        if(!document.getElementById('mobile1').value.match(numeric))
        {
            alert('Please enter valid mobile.');
            document.getElementById('mobile1').value='';
        }
    }
}
function validblank()
{
      if( document.getElementById('username1').value == '' || document.getElementById('email1').value == '' ||

      document.getElementById('feedbackform').value == '' || document.getElementById('mobile1').value == '')
           alert("Please fill the required fields");
}