var sec_num_1 = Math.floor(Math.random()*21);
var sec_num_2 = Math.floor(Math.random()*21);
function checkform ( form1 ){
        if (form1.fname.value == "" || form1.fname.value.length < 3) {
        alert( "Please enter your first name" );
        form1.fname.focus();
        return false ;
        }
		if (form1.lname.value == "" || form1.lname.value.length < 3) {
        alert( "Please enter your last name" );
        form1.lname.focus();
        return false ;
        }
  		if (form1.email.value == "") {
		alert( "Please enter your email address" );
		form1.email.focus();
		return false ;
		}
		
		if (form1.subject.value == "") {
	    alert( "Please enter the subject" );
		form1.subject.focus();
		return false;
		}
		
		if (form1.message.value == "" || form1.message.value.length < 10) {
	    alert( "Please give us more information in your message" );
		form1.message.focus();
		return false ;
		}
		
		var sec_result = parseInt(document.getElementById('sec_result').value);
  
  if (sec_result != sec_num_1 + sec_num_2) {
    sec_num_1 = Math.floor(Math.random()*21);
    sec_num_2 = Math.floor(Math.random()*21);
    alert('For validation, please fill in the sum of: ' + sec_num_1 + ' + ' + sec_num_2);
    document.getElementById('sec_result').focus();
    return false;
  }
		return true;
  
}