function noscroll(initial_height, minheight){
	var root= document.compatMode=='BackCompat'? document.body : document.documentElement;
	var isVerticalScrollbar= root.scrollHeight>root.clientHeight;
	var start=initial_height;
	var i=1;
	var h = start-i;
	while(isVerticalScrollbar&&(h>minheight)){
		h = start-i;
		document.body.style.height= h + 'px';
		var isVerticalScrollbar= root.scrollHeight>root.clientHeight;
		i++;
	}
	if(h==minheight){
		document.body.style.height=minheight+'px';
	}
	
}