function abrirMapa() { 

w = screen.width;
h = screen.height;

meio_w = w/2;
meio_h = h/2;


altura2 = 800/2;
largura2 = 600/2;


var width = 760;
var height = 600; 


var left = meio_w-largura2; 
var top = meio_h-altura2;

window.open('plantas.htm','mapa', 'width='+width+', height='+height+', top='+top+', left='+left+', scrollbars=no, status=no, toolbar=no, location=no, directories=no, menubar=no, resizable=no, fullscreen=no'); 

}