function prog1(objid)
    {
        var obj;
        obj=window.document.getElementById(objid);
        obj.style.backgroundColor="red";
        obj.style.color="yellow";
    }
    function prog2(objid)
    {
        var obj;
        obj=document.getElementById(objid);
        obj.style.backgroundColor="yellow";
        obj.style.color="red";
    }
    function blinktext()
    {
        if(p3.style.visibility=="visible")
        {
            p3.style.visibility="hidden";
        }
        else
        {
            p3.style.visibility="visible";
        }
        window.setTimeout("blinktext()",300);
    }

onmouseover="prog1('p1')" onmouseout="prog2('p1')"