var x,y;
var bd_ht = document.body.scrollHeight;
var bd_wd = document.body.offsetHeight
if (bd_ht > bd_wd) // all but Explorer Mac
{
	x = document.body.scrollWidth;
	y = document.body.scrollHeight;
}
else // Explorer Mac;
     //would also work in Explorer 6 Strict, Mozilla and Safari
{
	x = document.body.offsetWidth;
	y = document.body.offsetHeight;
}
if(screen.width == 800)
{
	y = y - 200;
}
if(screen.width == 1024)
{
	y = y - 450;
}
if(screen.width == 1280)
{
	y = y - 230;
}

document.getElementById('rt-table').style.height = y+"px";