$(document).ready(function(){
	
	/* An object with element selectors and margin values */
	
	var buttonMargins = {
		'#step1 a.button'	: '-100%',
		'#step2 a.finish'	: '-200%',
		'#step2 a.back'		: 0,
		'#step3 a.again'	: 0
	}
	
	var b = $('body');
	
	// Adding a click event listener to
	// every element in the object:
	
	$.each(buttonMargins,function(key,val){
		$(key).click(function(){
			b.animate({marginLeft:val});
			return false;
		});
	});
	
});