function open_window(win, params, width, height){
	if(width==0) width=500;
	width+=40;
	if(height==0) height=400;
	height+=40;
	if(height>600) height=600;
	if(params!='') win+=params
	info=window.open(win,'info','resizable=1, scrollbars=1, toolbar=0, status=0, width='+width+', height='+height);
	info.focus();
 }