window.onload=function(){
 clock();
}
var clock = function() {
        if (document.getElementById("clock")) 
				{
                a = document.getElementById("clock");
                if (isNaN(a.value) == true) {
                        a.value = 0;
                } 
				else 
				{
					a.value = parseInt(a.value) + 1;
                }
        }
        setTimeout("clock()", 1000);
}