var valueCmdFind = 'Buscar...';
var cmdFind = null;
window.onload = function () {
    cmdFind = document.getElementById('cmdFind');
    cmdFind.onfocus = function () {
        if (this.value == valueCmdFind) {
            this.value = '';
        }
    };
    cmdFind.onblur = function () {
        if (this.value == '') {
            this.value = valueCmdFind;
        }
    };

    var _valueCmdFind = cmdFind.value;
    if ( _valueCmdFind == '' ) {
        cmdFind.value = valueCmdFind;
    }

    var formFind = document.getElementById('formFind');
    formFind.onsubmit = function () {
        if (cmdFind.value == valueCmdFind) {
            cmdFind.value = '';
        }
    };
}