function get_pic_size(wid, hei, _x, _y, fileName, imgId) {
	
	ww = wid;
	hh = hei;

	var ratio = _x/_y;         
	var realRatio = ww/hh;
	var feature;
	if (ww > hh) {
		ww = _x;
		hh = _y/realRatio;
	} else {
		ww = _x*realRatio;
		hh = _y;
	}
	if (realRatio > ratio){
		feature = 1;
	}
	else {
		feature = 2;
	}
	
	document.getElementById(imgId).width = ww;
	document.getElementById(imgId).height = hh;
	show_pic(fileName, imgId, 'filename_span',feature,ww,hh,_x,_y);
}

function show_pic(fileName,img, alarmId,feature,ww,hh,_x,_y){
	
	var dImg = document.getElementById(img);
	if (feature==1) {
		dImg.style.marginTop = (_x-hh)/2 + "px";
		dImg.style.marginLeft = 0 + "px";
		dImg.style.width = ww + 'px';
		dImg.style.height = hh + 'px';
	}
	else {
		dImg.style.marginTop = 0 + "px";
		dImg.style.marginLeft = (_y-ww)/2 + "px";
		dImg.style.width = ww + 'px';
		dImg.style.height = hh + 'px';
	}
	//document.getElementById(alarmId).innerHTML = "";
//	if (fileName != 0) {
//		alert('filename');
//		dImg.src = dImg.src = "timthumb.php?src="+fileName+"&w="+_x+"&h="+_y+"&zc=0";
//	} else {
//		dImg.src = "images/shirt_graph_default.jpg";
//	}
	return true;
}