globalAlpha and draw image

[Vdovkin Konstantin]

Hi,

I download older versions of excanvas.js, and i saw, that value of
globalAlpha attribute don't take effect for drawImage method. I solve
this problemm by adding following code after 569 line (method
"contextPrototype.drawImage", before "vmlStr.push(' ">' ,
'<g_vml_:image src="', image.src, '"',")

if(parseFloat(this.globalAlpha) != 1.0) {
vmlStr.push('filter: alpha(opacity='+Math.round(parseFloat
(this.globalAlpha)*100)+');');
}