function validate(formName){

if(!formName){
	var formName = "contact";
}
var validationRule = new RegExp(/^[^@]+@([-\w]+\.)+[A-Za-z]{2,4}$/);

var nameField =  document.forms[formName].name.value;
var emailField =  document.forms[formName].email.value;
var subjectField =  document.forms[formName].subject.value;
var enquiryField =  document.forms[formName].enquiry.value;

    if( nameField.length == 0 ){
      alert("Please enter your name!");
      return false;
    }

    if( emailField.length == 0 ){
      alert("Please enter your email address!");
      return false;
    }

    if( !validationRule.test(emailField) ){
      alert("Please enter a valid email address!");
      return false;
    }

    if( subjectField.length == 0 ){
      alert("Please enter your subject!");
      return false;
    }

    if( enquiryField.length == 0 ){
      alert("Please enter your enquiry!");
      return false;
    }

document.forms[formName].submit();

}