function checkText(field, fieldName) {
  if (field.value == "") {
    alert("Please enter a value into the " + fieldName + " field.");
	field.focus();
	field.select();
	return false
  }
	return true 
}

function checkNumeric(field, fieldName) {
var valid = "0123456789."
var ok = "yes";
var temp;
	for (var i=0; i<field.value.length; i++) {
	temp = "" + field.value.substring(i, i+1);
	if (valid.indexOf(temp) == "-1") ok = "no";
	}
	if (ok == "no") {
		alert("Please only enter numbers into the " + fieldName + " field");
		field.focus();
		field.select();
		return false
	   }
return true
}