function validate(){

if(document.getElementById('fname').value==""){
  alert("Please mention your first name");
  document.getElementById('fname').focus();
  return false;
}
if(document.getElementById('surname').value==""){
  alert("Please mention your Surname");
  document.getElementById('surname').focus();
  return false;
}
if(document.getElementById('booking').value==""){
  alert("Please mention your booking date");
  document.getElementById('booking').focus();
  return false;
}
if(document.getElementById('people').value==""){
  alert("Please mention no. of people");
  document.getElementById('people').focus();
  return false;
}
if (isNaN(document.getElementById('people').value)) {
  	alert("Please enter no. of people in Numeric Form");
	document.getElementById('people').focus();
	return false;
}


if(document.getElementById('time').value==""){
  alert("Please mention time");
  document.getElementById('time').focus();
  return false;
}

var counter=0;

if(document.getElementById('home').value==""){
counter=counter+1;
}



if(document.getElementById('work').value==""){
counter=counter+1;
}



if(document.getElementById('mobile').value==""){
counter=counter+1;
}

if(counter==3){
alert("Please enter at least one of the contact number from home, work or mobile");
document.getElementById('home').focus();
  return false;
}

return true;
}