Yes, the warnings refer to two components (im1 & im2) of the same type (Component UIGraphic), here is the entire log message:
WARNING: Component UIGraphic j_id_s:im1 has no attribute alt or attribute resolves to null. Path to component
{Component-Path : [Class: javax.faces.component.UIViewRoot,ViewId: /input-element.xhtml][Class: javax.faces.component.html.HtmlBody,Id: __7][Class: javax.faces.component.html.HtmlForm,Id: j_id_s][Class: javax.faces.component.html.HtmlGraphicImage,Id: im1] Location: /input-element.xhtml at line 98 and column 27}
Mar 20, 2013 1:21:38 AM org.apache.myfaces.shared.renderkit.html.HtmlImageRendererBase encodeEnd
WARNING: Component UIGraphic j_id_y:im2 has no attribute url, value, name or attribute resolves to null. Path to component
{Component-Path : [Class: javax.faces.component.UIViewRoot,ViewId: /input-element.xhtml][Class: javax.faces.component.html.HtmlBody,Id: __7][Class: javax.faces.component.html.HtmlForm,Id: j_id_y][Class: javax.faces.component.html.HtmlGraphicImage,Id: im2] Location: /input-element.xhtml at line 116 and column 27}
Mar 20, 2013 1:21:39 AM org.apache.myfaces.shared.renderkit.html.HtmlImageRendererBase encodeEnd
WARNING: Component UIGraphic j_id_s:im1 has no attribute alt or attribute resolves to null. Path to component
{Component-Path : [Class: javax.faces.component.UIViewRoot,ViewId: /input-element.xhtml][Class: javax.faces.component.html.HtmlBody,Id: __7][Class: javax.faces.component.html.HtmlForm,Id: j_id_s][Class: javax.faces.component.html.HtmlGraphicImage,Id: im1] Location: /input-element.xhtml at line 98 and column 27}
These warnings have been reported first time for the ICEfaces3 Myfaces Regressions of February 14, 2013, with trunk rev# 33446, however they may occur for a longer time; no tomcat log files have been saved from previous regressions.