No picture in datefield button

i have no picture from an calendar in the button from the datefield.Hoe can I get there an calendar picture(icon).
It is now only an blue square.

Hi,

usually the calendar icon should be displayed properly without any further actions. It it is not, this has certainly something to do with the css for your template. Without taking a look at the form, I cannot help you with that.

Regards,
Aicha

Problem solved.
put in the custom.css from your template the code
.btn {
display: inline-block;
*display: inline;
*zoom: 1;
padding: 4px 12px;
margin-bottom: 0;
font-size: 13px;
line-height: 18px;
text-align: center;
vertical-align: middle;
cursor: pointer;
color: #333;
text-shadow: 0 1px 1px rgba(255,255,255,0.75);
background-color: #f5f5f5;
background-image: -moz-linear-gradient(top,#fff,#e6e6e6);
background-image: -webkit-gradient(linear,0 0,0 100%,from(#fff),to(#e6e6e6));
background-image: -webkit-linear-gradient(top,#fff,#e6e6e6);
background-image: -o-linear-gradient(top,#fff,#e6e6e6);
background-image: linear-gradient(to bottom,#fff,#e6e6e6);
background-repeat: repeat-x;
filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#ffffffff', endColorstr='#ffe5e5e5', GradientType=0);
border-color: #e6e6e6 #e6e6e6 #bfbfbf;
*background-color: #e6e6e6;
filter: progid:DXImageTransform.Microsoft.gradient(enabled = false);
border: 1px solid #bbb;
border-bottom-color: rgb(187, 187, 187);
*border: 0;
border-bottom-color: #a2a2a2;
-webkit-border-radius: 4px;
-moz-border-radius: 4px;
border-radius: 4px;
*margin-left: .3em;
-webkit-box-shadow: inset 0 1px 0 rgba(255,255,255,.2), 0 1px 2px rgba(0,0,0,.05);
-moz-box-shadow: inset 0 1px 0 rgba(255,255,255,.2), 0 1px 2px rgba(0,0,0,.05);
box-shadow: inset 0 1px 0 rgba(255,255,255,.2), 0 1px 2px rgba(0,0,0,.05);
}