function yelwline(y1,x1,y2,x2) 
{
      if (GBrowserIsCompatible()) {
        var line = new GPolyline([
  		  new GLatLng(y1,x1),
  		  new GLatLng(y2,x2)
		], "#FFFF00", 3);
		return(line);
      }
}  
    
    function redline(y1,x1,y2,x2) 
{
      if (GBrowserIsCompatible()) {
        var line = new GPolyline([
  		  new GLatLng(y1,x1),
  		  new GLatLng(y2,x2)
		], "#FF0000", 3);
		return(line);
      }
}