document.fff.button1.id="key1";

function callme(id,field)
{
remove();
clear();
var tag=document.getElementById(id);
tag.style.display="";
if(field.id=="key")
field.id="key1";
else
field.id="key";	

return false;
}

function callme_hover(id,field)
{
var tag=document.getElementById(id);
var disp=tag.style.display;
//alert(tag.style.display);
if(disp=="none")
    {
        if(field.id=="key")
        field.id="key1";
        else
        field.id="key";	
        return false;
    }

}

function clear()
{
window.document.fff.button1.id="key";
window.document.fff.button2.id="key";
window.document.fff.button3.id="key";
}

function remove()
{
var tag=document.getElementById("pdf");
tag.style.display="none";

var tag=document.getElementById("container1");
tag.style.display="none";

var tag=document.getElementById("container2");
tag.style.display="none";

}