Description:
Provides a polyfill for browsers that do not support the placeholder attribute on input elements.

Usage:
$( "input[type=text]" ).placeholder();

$( "input[type=text]" ).placeholder({
	tagName:	"div",
	polyClass:	"placeholder",
	wrapClass:	"placeholder-wrap",
	callback:	function ( e ) {
		// Do something	
	}
});

Note:
Keep the comment with the code please, thanks!