background:url('images/1.gif') no-repeat; /*不平铺*/
background:url('images/2.gif') repeat-x; /*横向平铺*/
background:url('images/3.gif') repeat-y; /*纵向平铺*/
background:url('images/1.gif') no-repeat; /*不平铺*/
background:url('images/2.gif') repeat-x; /*横向平铺*/
background:url('images/3.gif') repeat-y; /*纵向平铺*/