<IMG title="1" style="Z-INDEX: 103; LEFT: 148px; POSITION: absolute; TOP: 76px" onclick="Sum()" alt="" src="" name="img1"> function Sum()
{
var i=0;
i=window.document.all.PatientId.value.length;
if(i<8)
window.document.all.PatientId.value += window.document.all.img1.title;
}
{
var i=0;
i=window.document.all.PatientId.value.length;
if(i<8)
window.document.all.PatientId.value += window.document.all.img1.title;
}
<form name="form1" method="post" action="">
<input type="text" name="textfield">
</form>
function Sum()
{
var i=0;
var j=0;
i=window.document.all.PatientId.value.length;var imgObj=window.document.all('imgName');
if(i<8)
for (j=0;j<imgObj.length;j++)
window.document.all.PatientId.value+=imgObj[j].title;
}</script>
<INPUT id="PatientId" runat="server" style="Z-INDEX: 111; LEFT: 142px; POSITION: absolute; TOP: 18px" type="text" maxLength="8" size="20"><IMG title="1" id=imgName onclick="Sum()" alt="" src="">
<br><IMG title="2" id=imgName onclick="Sum()" alt="" src="">
<br><IMG title="3" id=imgName onclick="Sum()" alt="" src="">
<br>