Update URL query string and redirect

javascript_clicked_redirect

	
//HTML 

<select id="year_selector" onchange="redirectTo(this)">
  <option value="">Select Year</option>
  <option value="2014">2014</option><option value="2013">2013</option>
</select>
	

//Javascript

	function redirectTo(sel) {
		  var current_url = document.URL;
		  var param_year = sel.options[sel.selectedIndex].value;  
		  var new_url = current_url.replace(/year=\d{4}/g, 'year='+param_year);
		  window.location = new_url;
	}