$(".tabs").click(function() {
$(this).attr("href","newhref.com");
});
UPDATE
you can get attribute value like this,
$(this).attr("href") //will return '#educationDetails'
so you can check that value like this,
$(".tabs").click(function() {
if ($(this).attr("href") == "#tab1")
$(this).attr("href","#tab2");
else if ($(this).attr("href") == "#tab2")
$(this).attr("href","#tab1");
});
UPDATE-2
If you just want to change #tab1 to #tab2, not reverse. you can also do it like this way,
$('a.tabs[href="#tab1"]').click(function() {
$(this).attr("href","#tab2");
});