输入框文字特效  
JS Code:

function clearText(field){
    if (field.defaultValue == field.value) field.value = '';
    else if (field.value == '') field.value = field.defaultValue;
}

HTML Code:

<input type="text" value="Enter keyword here..." name="q" size="10" 
id="searchfield" title="searchfield" onfocus="clearText(this)" onblur="clearText(this)" />