function addPlaceHolder(elID) {
    if(document.getElementById(elID)) {
        var el = document.getElementById(elID);
		var pH = el.getAttribute('placeholder');
        if(pH !== 'undefined' && el.value == '') {
            el.value = pH;
            el.className += '_placeholder';
        }
    }
}
function clearPlaceHolder(elID) {
    if(document.getElementById(elID)) {
        var el = document.getElementById(elID);
		var pH = el.getAttribute('placeholder');
        if(pH !== 'undefined' && el.value == pH) {
            el.value = '';
            el.className = el.className.replace('_placeholder','');
        }
    }
}