if (typeof(alertObject) == 'undefined') 
{
    alertObject = function()
    {    	
        this.alertId   = 'alert';
        this.alertBody = '<div id="' + this.alertId +'"  class="alert_message" style="z-index: 9999;">{{message}}</div>';        
    }
}
alertObject.prototype.show = function(message)
{	
    $('body').prepend(this.alertBody.replace(/\{\{message\}\}/g, message));
    $('#' + this.alertId).center();        
}
alertObject.prototype.hide = function()
{	
    $('#' + this.alertId).remove();    
}