function sendAjaxCall_form1(){
	var field1 = $('#field1').attr('value');
	var field2 = $('#field2').attr('value');
	var field3 = $('#field3').attr('value');
	var field4 = $('#field4').attr('value');
        var re = /^[\w ]+$/;
	if ( !(field1) || !(field2)|| !(field3) || !(field4)) {
				if (!(field1)) {
						$('#field1').focus();
				}
				if (!(field2)) {
						$('#field2').focus();
				}
				if (!(field3)) {
						$('#field3').focus();
				}
				if (!(field4)) {
						$('#field4').focus();
				}
				

						alert('Sorry! You have to fill in all the information to submit your message.');
						return false;
 }

 // validation for field1(alphanumeric)
 if(!re.test(field1)) {
   $('#field1').focus();
   alert("Error: Input contains invalid characters!");
   return false;
 }
  // validation for field2(only numbers)
  if(isNaN(field2)) {$('#field2').focus();
      alert("Please enter only numbers");
      return false;
  }

 // validation for field3(email)
 if(!/^[a-zA-Z0-9._-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,4}$/.test(field3)) {
 $('#field3').focus();
      alert("Please provide a valid email address");
      return false;
  }

  // validation for field4(alphanumeric)
  if(!re.test(field4)) {
       $('#field4').focus();
       alert("Error: Input contains invalid characters!");
       return false;
  }
  $.ajax({
      type: "POST",
      url: "form_widget/send_mail.php",
      data : {
          field1 : field1,
          field2 : field2,
          field3 : field3,
          field4 : field4
    
      },
      success: function(response) {
          var res_arr = response.split('!@#$');
          if(res_arr[0] == 'success') {
              alert("Your message has been submitted");
          } else {
              alert("some error in sending mail");
          }
      }
  });
}