function merger(imgs,maxWidth){
if(!imgs)
return null;
maxWidth = maxWidth || 500;
var height = 0;
for (var i = 0; i < imgs.length; i++) {
var img = imgs[i];
if (img.width > maxWidth) {
height += img.height * (maxWidth / img.width);
continue;
}
height += img.height;
}
var canvas = document.createElement("canvas");
canvas.width = maxWidth+10;
canvas.height = height+10;
var ctx = canvas.getContext("2d");
var dheight = 10;
for (var i = 0; i < imgs.length; i++) {
var img = imgs[i];
var cheight = img.height;
var cwidth = img.width;
if (cwidth > maxWidth) {
cwidth = maxWidth;
cheight = img.height * (maxWidth / img.width);
}
ctx.drawImage(img, 10, dheight, cwidth, cheight);
dheight += cheight;
}
var dataurl = canvas.toDataURL('image/png');
return dataurl;
}
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