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"onload [your] window" ???
what do you mean?
you can attach an onload function event handler to the window object by many ways:
+ use the onload attribute of <body> element, either hardcoded in html source code, or by assigning a function at run time, or even by defining it through the use of addEventListener() method...
+ assign or attach (again with addEventListener) to the onload property / event of window (or document) object
assigning the 'onload' property allow you to define only one event handler (reassigning will overide previous value setted), while addEventListener() could define many (cumulative) ;)