function getObject(objectId) {
if(document.getElementById && document.getElementById(objectId)) {
return document.getElementById(objectId);
} else if (document.all && document.all(objectId)) {
return document.all(objectId);
} else if (document.layers && document.layers[objectId]) {
return document.layers[objectId];
} else {
return false;
}
}

function boxue(n){
for(var i=1;i<=5;i++){
if (i==n){
getObject('a'+i).className='Certification_a1';
getObject('b'+i).className='Certification_b1';
getObject('c'+i).className='Certification_c1';
getObject('d'+i).className='Certification_d1';
getObject('e'+i).className='Certification_e1';
getObject('g'+i).className='Certificationbox';
}
else {
getObject('a'+i).className='Certification_a';
getObject('b'+i).className='Certification_b';
getObject('c'+i).className='Certification_c';
getObject('d'+i).className='Certification_d';
getObject('e'+i).className='Certification_e';
getObject('g'+i).className='Certificationbox1';
}
}
}