elimde şöyle bir kod var ama aynı sayfada iki defa kullanamıyorum yardım edermisiniz arkadaşlar teşekkürler

<SCRIPT language=javascript>
			function setImage(url)
			{				 
				var elem;
				
				elem=document.getElementById("imgBig");
				elem.src=url; 
			}
			function openPopup(url,h)
			{	
				window.open(url,
				"Modeller",
				"height="+h+",width=500,top=100,left=100,status=yes,toolbar=no,menubar=no,location=no,scrollbars=yes").focus();    				
			}			
		</SCRIPT>


<SCRIPT language=javascript type=text/javascript>
<!--
	function __doPostBack(eventTarget, eventArgument) {
		var theform;
		if (window.navigator.appName.toLowerCase().indexOf("microsoft") > -1) {
			theform = document.Form1;
		}
		else {
			theform = document.forms["Form1"];
		}
		theform.__EVENTTARGET.value = eventTarget.split("$").join(":");
		theform.__EVENTARGUMENT.value = eventArgument;
		theform.submit();
	}
// -->
  </SCRIPT>
 
<TABLE cellSpacing=0 cellPadding=0 width="483" align=center border=0 height="307">
  <TBODY>
  <!--Galeri Bilgileri-->
  <!--Ä°lan Bilgileri-->
  <TR>
    <TD align=middle height="1" width="728">
      <TABLE 
      style="BORDER-RIGHT: #587c93 1px solid; BORDER-LEFT: #587c93 1px solid; BORDER-BOTTOM: #587c93 1px solid" 
      cellSpacing=0 cellPadding=0 width=728 align=center border=0>
        <TBODY>
        <TR>
          <TD height=5></TD></TR>
        <TR>
          <TD width=410><!--Resimler-->
            <TABLE cellSpacing=0 cellPadding=0 align=center border=0>
              <TBODY>
              <TR>
                <TD align=middle width=420><IMG id=imgBig 
                  src="deneme/1_image_for_silan_693282" width=400 
                  name=imgBig></TD></TR>
              <TR>
                <TD height=5></TD></TR>
              <TR>
                <TD align=middle width=420>
                  <TABLE cellSpacing=0 cellPadding=0 width=400 align=center 
                  border=0>
                    <TBODY>
                    <TR>
                      <TD width=75><IMG id=dimTemp1 style="WIDTH: 75px" 
                        onclick=setImage(this.src) alt="" 
                        src="deneme/1_image_for_silan_693282" 
                      border=0></TD>
                      <TD width=4></TD>
                      <TD width=75><IMG id=dimTemp2 style="WIDTH: 75px" 
                        onclick=setImage(this.src) alt="" 
                        src="deneme/2_image_for_silan_693282" 
                      border=0></TD>
                      <TD width=4></TD>
                      <TD width=75><IMG id=dimTemp3 style="WIDTH: 75px" 
                        onclick=setImage(this.src) alt="" 
                        src="deneme/3_image_for_silan_693282" 
                      border=0></TD>
                      <TD width=4></TD>
                      <TD width=75><IMG id=dimTemp4 style="WIDTH: 75px" 
                        onclick=setImage(this.src) alt="" 
                        src="deneme/4_image_for_silan_693282" 
                      border=0></TD>
                      <TD width=4></TD>
                      <TD width=75><IMG id=dimTemp5 style="WIDTH: 75px" 
                        onclick=setImage(this.src) alt="" 
                        src="deneme/5_image_for_silan_693282" 
                      border=0></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></TD>
</table>