jQuery(document).ready(function(){

	//If the container exists
	if(jQuery("#products") != null){
		//Loop through each class, including the index of the object(i)
		jQuery(".one_product").each(function(i){
			//Since 0 based add one, for every 3rd object remainder will equal 0
			var remainder = (i + 1) % 3;
			//Add css propety 
			if(remainder === 0){
				jQuery(this).css('background', '#fff');
			}
		});
	}
 });