I have had this issue recently - I use modernizr to detect html5 features and then run a bit of js for the browsers that can't cope:
function addPlaceHolder(input) {//using modernizr add placeholder text for non html5 users
if (!Modernizr.input.placeholder) {
input.focus(function () {
if (input.val() == input.attr('placeholder')) {
input.val('');
input.removeClass('placeholder');
}
}).blur(function () {
if (input.val() == '' || input.val() == input.attr('placeholder')) {
input.addClass('placeholder');
input.val(input.attr('placeholder'));
}
}).blur();
$(input).parents('form').submit(function () {
$(this).find(input).each(function () {
if (input.val() == input.attr('placeholder')) {
input.val('');
}
})
});
}
}
addPlaceHolder($('#Myinput'));
seems to work well for me!