I've been ranked 3 and 4 nearly a month now for a keyword. Yesterday, I was messing with the HTML template and removed the footer credit (which contain some other website's backlink). 10 hrs later, my website disappeared from first page and It got moved to #140 in serps! I already changed to template back and nothing has changed. Does anyone know what is the problem and can help me solve this? Thanks! Also I checked for backlinks, all my backlinks are gone! However, when I check site:http://www.mywebsite.com still shows on google. Any one knows why is this happening?