showing an image with css Gradiant effect

[firefly]

I am applying the css gradiant effect to a "th" column of table like this,\[code\] background: -moz-linear-gradient(top,white 5%,#D6DFE3); background: linear-gradient(top,white 5%,#D6DFE3);\[/code\]Later i have to append a class whose css is some thing like this one in which i want to show an image\[code\].Img{ background-image:url(../images/asc.png); background-color:Green;}\[/code\]I am appending the .Img class the th. But the image is not showing because of the gradient effect. How can i solve this issue.