function addLoadEvent(func) {

  var oldonload = window.onload;

  if (typeof window.onload != 'function') {

    window.onload = func;

  } else {

    window.onload = function() {

    if (oldonload) {

      oldonload();

    }

    func();

    }

  }

}



loader = function() {

  document.getElementById('skillexptab').onclick = function() { switchSection('skillexp') };

  document.getElementById('edutab').onclick = function() { switchSection('edu') };

  document.getElementById('workexptab').onclick = function() { switchSection('workexp') };

  document.getElementById('contacttab').onclick = function() { switchSection('contact') };

  document.getElementById('porttab').onclick = function() { switchSection('port') };

}



function switchSection(id)

{

  document.getElementById('content').style.height = "0";

  var tabId = id + 'tab';

  var sections = [];

    sections[0] = "skillexp";

    sections[1] = "edu";

    sections[2] = "workexp";

    sections[3] = "contact";

    sections[4] = "welcome";

    sections[5] = "port";

  var sectionTabs = [];

    sectionTabs[0] = "skillexptab";

    sectionTabs[1] = "edutab";

    sectionTabs[2] = "workexptab";

    sectionTabs[3] = "contacttab";

    sectionTabs[4] = "welcometab";

    sectionTabs[5] = "porttab";

  for(var i = 0; i <= 5; i++)

  {

    var section = sections[i];

    var tab = sectionTabs[i];

    if(section != id)

    {

      document.getElementById(section).style.display = "none";

      if(tab != sectionTabs[4])

      {

        if(document.getElementById(tab).className == "sel")

        {

          document.getElementById(tab).className = "norm";

        }

      }

    }

  }

  document.getElementById(id).style.display = "block";
test = document.getElementById(id).offsetHeight; 
var test3 =0;

  for(var j = 0; j <= 100; j++) {
    test2 = test * j / 100;

    setTimeout("document.getElementById('content').style.height = '" + test2 + "px';", (j) * 10);
  }
  if(id != "welcome")

  {

    document.getElementById(tabId).className = "sel";

  }

}



addLoadEvent(loader);