[Ex_Soft]

евент срабатывает при первой же загрузке окна

К стати - да

Ext.onReady(function() {
			var win = new Ext.Window({
				width : 1465,
				height: 785,
				id : 'autoload-win',
				autoScroll : true,
				html: '<div id="generateImage"><img id="target" alt="generateImg" height="{height}" width="{width}" /></div>',
				listeners:{
					resize: function (panel, w,h){
						$("#target").one('load', loadCallback).attr('src', adresse).each(function () {
							if (this.complete) $(this).trigger('load');
						});
					}
				}
			});
				  
			win.show();
			
*!*
			$("#target").one('load', loadCallback).attr('src', adresse).each(function () {
				if (this.complete) $(this).trigger('load');
			});
*/!*

			$('#target').imgAreaSelect({
				handles: true,
				movable: false,
				resizable: false,
				autoHide: true,
				onSelectEnd: function (img, selection) {
					$("#target").one('load', loadCallback).attr("src", adresse + "&x1=" + selection.x1 + "&y1=" + selection.y1 + "&width=" + selection.width + "&height=" + selection.height).each(
						function () {
							if ($("#target").complete) 
								$("#target").trigger('load');
						});
				}
			});
		});

лишнее...