function float_window_letter () {
cWidth=document.body.clientWidth;
cHeight=document.body.clientHeight;
sTop=document.body.scrollTop;
with(document.getElementById('letter'))
    {width=480;
	 height=510;
	 style.visibility='visible';
	 style.left=(cWidth-625)/2 + 50;
	 style.top=((cHeight-490)/2)+sTop;
	 //style.left=(cWidth+180)/2;
	 //style.top=scrolledDown+150+'px';
	}
}



function float_window_feedback() {
cWidth=document.body.clientWidth;
cHeight=document.body.clientHeight;
sTop=document.body.scrollTop;
scrolledDown = document.body.parentNode.scrollTop;
with(document.getElementById('feedback'))
	{width=625;
	 height=420;
	 style.visibility='visible';
	 style.left=(cWidth-625)/2;
	 style.top=((cHeight-420)/2)+sTop;
	 //style.left=(cWidth+180)/2;
	 //style.top=scrolledDown+150+'px';
	}
}


function float_window_feedback_ok() {
cWidth=document.body.clientWidth;
cHeight=document.body.clientHeight;
sTop=document.body.scrollTop;
scrolledDown = document.body.parentNode.scrollTop;
with(document.getElementById('feedback_ok'))
	{width=370;
	 height=250;
	 style.visibility='visible';
	 style.left=(cWidth-370)/2;
	 style.top=((cHeight-250)/2)+sTop;
	 //style.left=(cWidth+180)/2;
	 //style.top=scrolledDown+150+'px';
	}
}