Use if statement with String.localeCompare : String comparisons « String « JavaScript Tutorial

1. JavaScript Tutorial
2. String
3. String comparisons

var oStringObject1 = new String("yellow");
var oStringObject2 = new String("brick");
var iResult = sTestString.localeCompare("brick");

if(iResult < 0) {
    alert(oStringObject1 + "comes before "+ oStringObject2);
} else if (iResult > 0) {
    alert(oStringObject1 + "comes after "+ oStringObject2);
} else {
    alert("The two strings are equal");
}