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Please enter your last name.
SAMPLE CODE <form onSubmit="return checkForLastName();"> Please enter your last name. <br><br> <input type="text" id="lastNameField"> <br><br> <input type="submit" value="Submit Form"> </form> <SCRIPT type="text/javascript" > function checkForLastName() { alert("Test"); var targetedField = document.getElementById("lastNameField") if (targetedField.value.length == 0) { alert("Please enter your last name"); targetedField.focus(); targetedField.style.background = "yellow"; return false; } //targetedField.style.background = "white"; alert("The last name is: " + targetedField.value); } </Script>