Placeholder support for older browsers

supportPlaceholder.js

$.fn.supportPlaceholder = function(){
	if(!Modernizr.input.placeholder) {
		
		// Populate field with placeholder text
		var placeholderText = $(this).attr("placeholder");
		$(this).val(placeholderText).css({"color" : "#999"});
		
		// Clear text if they focus
		$(this).focus(function(){
			$(this).val("").css({"color" : "#333"})
		});

		// If value is still empty when they change focus, reset
		$(this).blur(function(){
			if(!$(this).val()){
				$(this).val(placeholderText).css({"color" : "#999"});
			};
		});
	}	
}

Requires modernizr to work.