document.getElementById("tab4").innerHTML = '<table id="calendar"><tr><td><a href="#" id = "week_decr" onclick="return false;"> < </a></td><td id="calendar_week"></td><td><a href="#" id="week_incr" onclick="return false;"> > </a></td></tr></table><table id ="calendar_days"><tr><td><a href="#" id="calendar_day1">1</a></td><td><a href="#" id="calendar_day2">2</a></td><td><a href="#" id="calendar_day3">3</a></td><td><a href="#" id="calendar_day4">4</a></td><td><a href="#" id="calendar_day5">5</a></td><td><a href="#" id="calendar_day6">6</a></td><td><a href="#" id="calendar_day7">7</a></td></tr></table><p id="calendar_text">heeej</p>';