function tab1(page) {
mframe.location ="http://www.essexstudent.com/test/tab1/"
}

function tab2(page) {
mframe.location ="http://www.essexstudent.com/test/tab2/"
}

function tab3(page) {
mframe.location ="http://www.essexstudent.com/test/tab3/"
}

function tab4(page) {
mframe.location ="http://www.essexstudent.com/test/tab4/"
}