function checkCSS(){
document.location.href="http://jigsaw.w3.org/css-validator/validator?usermedium=all&uri="+window.location;
}
function checkXHTML(){
document.location.href="http://validator.w3.org/check?uri="+window.location;
}
function checkWAI_A(){
document.location.href="http://www.tawdis.net/taw3/online?nivel=1&url="+window.location;
}
function checkWAI_AA(){
document.location.href="http://www.tawdis.net/taw3/online?nivel=2&url="+window.location;
}
function checkWAI_AAA(){
document.location.href="http://www.tawdis.net/taw3/online?nivel=3&url="+window.location;
}