function isEmpty(field,alerttxt) {
	if (field.value==null||field.value=="")	{
		alert(alerttxt);
		field.focus();
		return false;
	}
	else	{
		return true;
	}
}

function isValidEmail(field){
	validRegExp = /^[^@]+@[^@]+.[a-z]{2,}$/i;
	strEmail = field.value;
	if (strEmail.search(validRegExp) == -1) {
		alert('Please enter valid email address');
		field.focus();
		return false;
	} 
	return true; 
}

  function checkNumeric(field) {
	  var anum=/(^\d+$)|(^\d+\.\d+$)/
	  if (!anum.test(field.value)){
		  alert("Please enter valid phone number");
		  return false;
	  }
	  return true;
 }

function valbutton(field, alerttxt) {
	myOption = 0;
	for (i=field.length-1; i > -1; i--) {
		if (field[i].checked) {
			return true;
		}
	}
	alert(alerttxt);
	return false;
}

function check(field, alerttxt) {
	if(field.checked == false ) {
		alert(alerttxt);
		return false;
	}
	return true;
}