function centerMap() {
    
   // alert(LAT)
  var myLatlng = new google.maps.LatLng(25.755451,-100.103214);
  var myOptions = {
    zoom: 7,
    center: myLatlng,
    mapTypeId: google.maps.MapTypeId.ROADMAP
  }
  
 var canvas = document.getElementById('map_canvas');
 
if (canvas!=null){
 
  var map = new google.maps.Map(canvas, myOptions);
    
   var marker = new google.maps.Marker({
      position: myLatlng, 
      map: map
  }); 
  }
    
}

$(document).ready(function(){
   
    
   if ($("#map_canvas"))
       {
           centerMap();
       }
     
});