thank you.i used below code and it worked.
var button1,button2,button3;
function initializePlayer()
{
button1=document.getElementById("button1");
button2=document.getElementById("button2");
button3=document.getElementById("button3");
button1.addEventListener("click",buttonClick,false);
button2.addEventListener("click",buttonClick,false);
button3.addEventListener("click",buttonClick,false);
}
window.onload=initializePlayer;
function buttonClick()
{
if(!vid.paused){vid.pause();}
}