var ns = document.layers;
  var ie = document.all;
  function time2ms(str) {
    var str = new String(str);
	var re = /^([\d]{1,2}):([\d]{1,2}):([\d.]+)$/gi;
	var sec = str.replace(re, function($0,$1,$2,$3) {
	    var h = parseInt($1)*60*60;
		var m = parseInt($2)*60;
		var s = $3 * 1;
		var r = ((h+m+s)*1000);
		//alert(r);
		return r;
	  }
	);
	return sec;
  }
  function jump_ra() {
    if(document.MediaPlayer.GetCanSeek()) {
	  if(ns) {
	    var s = parseInt(document.dropdown.document.xchapter.jpos.selectedIndex);
	    var v = document.dropdown.document.xchapter.jpos.options[s].value;
	  }
	  else {
	    var s = parseInt(document.xchapter.jpos.selectedIndex);
	    var v = document.xchapter.jpos.options[s].value;
	  }
	  //alert("s:"+s+",v:"+v);
	  if(v) document.MediaPlayer.SetPosition(time2ms(v));
	}
  }