Yes it get s auto generated the missing files are represented as below, the question is whre do I need to copythese image files to so they are visible? I have include the image of the calendar - the month changer arrows are missing
/* states and images */
.ui-icon { width: 16px; height: 16px; background-image: url(../images/ui-icons_505050_256x240.png); }
.ui-widget-content .ui-icon {background-image: url(../images/ui-icons_505050_256x240.png); }
.ui-widget-header .ui-icon {background-image: url(../images/ui-icons_ffffff_256x240.png); }
.ui-state-default .ui-icon { background-image: url(../images/ui-icons_ffffff_256x240.png); }
.ui-state-hover .ui-icon, .ui-state-focus .ui-icon {background-image: url(../images/ui-icons_27343C_256x240.png); }
.ui-state-active .ui-icon {background-image: url(../images/ui-icons_ffffff_256x240.png); }
.ui-state-highlight .ui-icon {background-image: url(../images/ui-icons_F4C424_256x240.png); }
.ui-state-error .ui-icon, .ui-state-error-text .ui-icon {background-image: url(../images/ui-icons_e40000_256x240.png); }