CSS works fine on mozilla and chrome but fails on IE

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Hi,

I have written HTML pages where i have used CSS to give effect to images. The code works fine on mozilla and chrome but fails to work on IE. The image is getting some background effect in IE where in mozilla and chrome there is no background effect.
The code in my css file is:

.imgCustom
     {
      width:110px;
     height:70px;
background-image:none;
     }

.imgCustom1
     {
      width:90px;
     height:50px;
background-image:none;
     }

a img {
border:none;
}

Let me know what i need to change or include to avoid this.