function changeLinks()
{

docURL = new String (document.URL);

if ( docURL.indexOf("_rus.html") != -1 ) {
  engURL = docURL.replace("_rus.html",".html");
  rusURL = document.URL;
  }
else {
  if ( docURL.indexOf("_rus.php") != -1 ){ 
        engURL = docURL.replace("_rus.php",".php");
        rusURL = document.URL;
	}
  else {
    if ( docURL.indexOf(".html") != -1 ){ 
	  rusURL = docURL.replace(".html","_rus.html");
  	  }
    else{
 	  rusURL = docURL.replace(".php","_rus.php");
	  }
    engURL = document.URL;
    }
  }

document.getElementById('engAnchor').href=engURL;
document.getElementById('rusAnchor').href=rusURL;
}