var panels = new Array('all','blad1','blad2','blad3');

var selectedTab = null;

function showPanel(tab, name)
{
if (selectedTab)
{
selectedTab.style.backgroundColor = '';
selectedTab.style.color = '#FFFFFF';
selectedTab.style.paddingTop = '';
selectedTab.style.paddingBottom = '';
}
selectedTab = tab;
selectedTab.style.backgroundColor = '#6E2C09';
selectedTab.style.color = '#ffffff';
selectedTab.style.paddingTop = '';
for(i = 0; i < panels.length; i++)
{
document.getElementById(panels[i]).style.display = (name == panels[i]) ? 'block':'none';

}
return false;
}