var currentTab;
var lastTab;

function changeTab(currentTab) {
document.getElementById(lastTab + "tab").style.fontWeight="normal";
document.getElementById(lastTab + "tab").style.backgroundImage="url(http://www.udel.edu/udaily/images/greydot.jpg)";
document.getElementById(lastTab + "box").style.display="none";
document.getElementById(currentTab + "tab").style.fontWeight="bold";
document.getElementById(currentTab + "tab").style.backgroundImage="none";
document.getElementById(currentTab + "box").style.display="block";
lastTab = currentTab;
}

function setTab(currentTab) {
document.getElementById(currentTab + "tab").style.fontWeight="bold";
document.getElementById(currentTab + "tab").style.backgroundImage="none";
document.getElementById(currentTab + "box").style.display="block";
lastTab = currentTab;
}