tabPanel("Maps",
                     tags$div(class="span4",selectInput("LatColumnSelected", "Latitude column :",choices="", multiple=FALSE)),
                     tags$div(class="span4",selectInput("LongColumnSelected", "Longitude column:",choices="", multiple=FALSE)),
                     selectInput('sizeAttribute', 'Scales points on :', choices="", multiple=FALSE),
                     htmlOutput('webmap'),
                     div(id='map',style='width: 100%; height: 600px;'),
                     div(id='status'),
                     sliderInput('maxSize', 'Max. point size', value=25, min=1, max=100),
                     plotOutput('ggmap')),