var btnLogin = new Ext.Button({
             text: 'Login',
             scale   : 'large',
             width : 100,
             iconCls: 'checkicon',
             iconAlign: "right",

             handler: function(){
               if(Ext.getCmp('username').getValue() !== '' && Ext.getCmp('password').getValue() !== ''){
                 loginForm.getForm().submit({
                   url: 'authenticate.php',
                   method: 'POST',
                   params: {
                     response: hex_md5(Ext.getCmp('challenge').getValue()+hex_md5(Ext.getCmp('password').getValue()))
                   },
                   success: function(){
                     window.location = 'tabs-adv.html';
                   },
                   failure: function(form, action){
                     Ext.MessageBox.show({
                       title: 'Error',
                       msg: action.result.message,
                       buttons: Ext.Msg.OK,
                       icon: Ext.MessageBox.ERROR
                     });
                   }
                 });
               }else{
                 Ext.MessageBox.show({
                   title: 'Error',
                   msg: 'Please enter user name and password',
                   buttons: Ext.Msg.OK,
                   icon: Ext.MessageBox.ERROR
                 });
               }
             }
           })

问题

Login和check图标间隙太大，如何让check图标和Login文本粘在一起，或者让iconCls向左对齐。

更新

.checkicon {
    margin-right: 25px;
    background-image:url(../images/CheckIcon.png) !important;
}