img1 = new Image();
img1.src = "images/tab1.gif";
img2 = new Image();
img2.src = "images/tab2.gif";
img3 = new Image();
img3.src = "images/tab3.gif";
img4 = new Image();
img4.src = "images/tab4.gif";

function updatecounter(form)
{
	var oldsubmit = form.action;
	form.action = 'counter.php';
	form.target = 'counter';
	form.submit();
	form.action = oldsubmit;
	form.target = '';
}

function showtab(tabid)
{
    if (document.getElementById)
    {
        for (i=1; i<5; i++)
        {
            if (tabid==i) document.getElementById('tab'+i).style.display = 'block'
            else document.getElementById('tab'+i).style.display = 'none'
        }
        document.getElementById('tabsearch').style.backgroundImage = 'url(images/tab'+tabid+'.gif)'
    }
    else if (document.all)
    {
        for (i=1; i<5; i++)
        {
            if (tabid==i) document.all['tab'+i].style.display = 'block'
            else document.all['tab'+i].style.display = 'none'
        }
    }
    else if (document.layers)
    {
        for (i=1; i<5; i++)
        {
            if (tabid==i) document.layers['tab'+i].display = 'block'
            else document.layers['tab'+i].display = 'none'
        }
    }
}