_ajaxCreateImg: function(dataUrl, startNumber)
{
var firstRequest = 0;
var lastRequest = 0;
var dataUrlPart = dataUrl.substr(startNumber, this.postSize);
this.preventUpdate();
if(startNumber == 0){
firstRequest = 1;
}
if(dataUrl.length < startNumber + this.postSize){
lastRequest = 1;
}
new Ajax.Request(this.createImgUrl, {
method: 'post',
asynchronous: true,
parameters: {
productId: this.tools.config.product_id,
reservedImgId: this.reservedImgId,
pngData : dataUrlPart,
lastRequest : lastRequest,