function prog(){
prog_window = window.open("http://www.erjon.nl/prog.html","prog","status=1, width=600,height=400");
}
function host(){
host_window = window.open("http://www.erjon.nl/host.html","host","status=1, width=600,height=400");
}
function cms(){
cms_window = window.open("http://www.erjon.nl/cms.html","cms","status=1, width=600,height=400");
}
function logo(){
cms_window = window.open("http://www.erjon.nl/logo.html","logo","status=1, width=600,height=400");
}