Before installation set hooks
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/admin_XXX/themes/default/template/controllers/login/

header.tpl... this hook between tag <head></head>        {hook h="loginPageHeader"}
content.tpl... this hook bottom of document              {hook h="loginPageFooter"}




If not in function, then check the file mode
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/modules/loginpageslide/image   >   0777




Images
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Upload image format shold be  1.8 : 1