var namesVec_b = new Array("importacao_bt2.jpg", "importacao_bt2_1.jpg");
var root='images/';

function toggle_b(image,showorhide){
if (showorhide=="show") {image.setAttribute('src',root+namesVec_b[0]);}
if (showorhide=="hide") {image.setAttribute('src',root+namesVec_b[1]);}

nr = image.getAttribute('src').split('/');
nr = nr[nr.length-1]

if(nr==namesVec_b[0]){image.setAttribute('src',root+namesVec_b[1]);}
else{image.setAttribute('src',root+namesVec_b[0]);}

}