Hi,
We are using your excanvas javascript in the our project to draw
signature it is working in the crome but not in IE7.

My code is :
//if i use this code in crome it working

        try{
        var c = document.getElementById('canvas');
                var img    = c.toDataURL("image/png");
        }catch(e)
        {
        alert(e.message); //This thrown exception Object doesn't support this
property or method.
        }
        try{
                var xhr = new XMLHttpRequest();
                xhr.open("POST",'sendsig.php', true);
                xhr.setRequestHeader('Content-Type', 'application/upload');
                xhr.send(img);
                alert("done");
        }catch(e1)
        {
                alert(e1.message);
        }

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