Site dropping out of search engines

[ZrzaTurwa]

Hi people i need some advice for over a year now i have been number 1 in all of the search engines, i have recently seen my site dropping places and am now nearly invisible in all of the search engines for the keyword "costa blanca rentals" i just seem to have disapeared, I am wondering if it is because of my link building i have been doing, i have been submitting to directories (