function clientHeight(){ 
var clientHeight;
if (document.documentElement && document.documentElement.clientHeight)
clientHeight = document.documentElement.clientHeight;
else if (document.body)
clientHeight = document.body.clientHeight;
return clientHeight;
}

function clientWidth(){ 
var clientWidth;
if (document.documentElement && document.documentElement.clientWidth)
clientWidth = document.documentElement.clientWidth;
else if (document.body)
clientWidth = document.body.clientWidth;
return clientWidth;
}