how to set a polyline on google maps every time when i click twice(make two markers) on maps,

this is my code :
thanks
<!DOCTYPE html PUBLIC "-//WAPFORUM//DTD XHTML Mobile 1.0//EN" "http://www.wapforum.org/DTD/xhtml-mobile10.dtd"&gt;
<html xmlns="http://www.w3.org/1999/xhtml" >
    <head> 
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 
        <meta name="viewport" content="width=device-width,minimum-scale=1.0,maximum-scale=5.0,user-scalable=yes">

    </head>
<body onload="initialize()" onunload="GUnload()">

<style type="text/css">

</style>

<div id="map_canvas" style="width: 500px; height: 300px;float:left;"></div>

<script src="jquery-1.4.2.js" type="text/javascript"></script>
<script src="jquery-ui-1.8rc3.custom.min.js" type="text/javascript"></script>
<script src="http://maps.google.com/maps?file=api&amp;amp;v=2&amp;amp;key=ABQIAAAA-7cuV3vqp7w6zUNiN_F4uBRi_j0U6kJrkFvY4-OX2XYmEAa76BSNz0ifabgugotzJgrxyodPDmheRA&amp;sensor=false"type="text/javascript"&gt;&lt;/script&gt;

<script type="text/javascript">

//**********
function initialize() {

    if (GBrowserIsCompatible()){
        //var map = new GMap2(document.getElementById("map_canvas"));
        //map.setCenter(new GLatLng(39.9493, 116.3975), 13);

        var map = new GMap2(document.getElementById("map_canvas"));
        var center=new GLatLng(39.917,116.397);
        map.setCenter(center, 13);
        map.addOverlay(new GMarker(new GLatLng(39.917,116.397)));
        map.enableDrawing()
        //GEvent.addListener(map, "mouseover", function() {
          //alert("您点击了地图。");
        //});
        var one;
        aFn=function(y_scale,x_scale){
            //************
                //function p(){
                        var bounds = map.getBounds();
                        var southWest = bounds.getSouthWest();
                        var northEast = bounds.getNorthEast();
                        var lngSpan = northEast.lng() - southWest.lng();
                        var latSpan = northEast.lat() - southWest.lat();
                        var point = new GLatLng(southWest.lat() + latSpan * (1-y_scale),
                          southWest.lng() + lngSpan * x_scale);
                        if(!one){
                            map.addOverlay(new GMarker(point));
                            one=point;
                        }else{
                            var polyline = new GPolyline([one,point], "#ff0000", 5);
                            map.addOverlay(polyline);
                            one=0;
                        }

                }

        //**********



        //*************

  }
}


</script>
</body>
</html>
ansaurus

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how to set a polyline on google maps every time when i click twice(make two markers) on maps,

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