var delta,w=312,h=232,per=50,iid
function zoom()
{
	var nper=per+delta;
	if((nper>=50)&&(nper<=100))
	{
		per=nper;
		var adi;
		if(document.getElementById)
			adi=document.getElementById("adi");
		else
			adi=window.adi;
		with(adi)
		{
			width=w*per/100;height=h*per/100;
		}
	}
	else
	clearInterval(iid)	
}

function szoom(x)
{
	delta=x;iid=window.setInterval("zoom()",50);
}