var locationHint = '市、州、国、郵便番号';

function locationFocus(elem, focus_gained) {
    if (focus_gained) {
        if (elem.value != '' && elem.value == "市、州、国、郵便番号") {
            elem.value = "";
        }
    } else {
        if (elem.value == "") {
            elem.value = "市、州、国、郵便番号";
        }
    }
}