x = document.body.clientWidth/2 - 150;
y = 150;

function confirmDelete() {
    if (confirm("Вы подтверждаете удаление?")) {
        return true;
    } else {
        return false;
    }
}

function setVisible(obj, obtop)
{
	obj = document.getElementById(obj);
	obj.style.visibility = (obj.style.visibility == 'visible') ? 'hidden' : 'visible';
	obj.style.top = obtop;
}

function placeIt(obj)
{
	obj = document.getElementById(obj);
	if (document.documentElement)
	{
		theLeft = document.documentElement.scrollLeft;
		theTop = document.documentElement.scrollTop;
	}
	else if (document.body)
	{
		theLeft = document.body.scrollLeft;
		theTop = document.body.scrollTop;
	}
	theLeft += x;
	theTop += y;
	obj.style.left = theLeft + 'px' ;
	obj.style.top = theTop + 'px' ;
	setTimeout("placeIt('message_form')",500);
}

window.onscroll = setTimeout("placeIt('message_form')",500);