Onclick into a Layout-Cell ?!

Hello

I’m loading FORM-LABELS and ONCLICK i would like to load the url in the second LAYOUT (Layout[1].cells(‘b’)).
How can i realize that?

Code

      function doOnLoad() {
			Layout = new Array();
			Form   = new Array();
			
			// -----------------------------------LAYOUT--------------------------------------
			
			Layout[1] = new dhtmlXLayoutObject(document.body, '2U');
			Layout[1].setEffect('collapse', true);
			Layout[1].setEffect('resize', true);
			Layout[1].setEffect('highlight', true);						
			Layout[1].cells('a').setWidth('230');	
			Layout[1].cells('a').fixSize(true, true);
			Layout[1].cells('b').fixSize(true, true);		
			Layout[1].cells('a').hideHeader();	
			Layout[1].cells('b').hideHeader();
			
			// -----------------------------------TOOLBAR-------------------------------------
			
	       Toolbar = Layout[1].cells('a').attachToolbar();
		    Toolbar.setIconsPath("../images/icons/");
		    Toolbar.setSkin('dhx_skyblue');	
		    Toolbar.addButton("close2", 0, "Schliessen", "Exit.png", "Exit.png");	
		    Toolbar.attachEvent("onClick", function(id) { Button_laden(id,0,1,'<?php echo $window; ?>'); });
			
			// ---------------------------------KATEGORIEN------------------------------------
			
			formdata = [
			   {type: "fieldset", label: "Thema", width: 210, offsetLeft: 7, offsetTop: 3, list: [
			      
				  <?php if ($job == 4) { ?>
				  {type: "label", name: "field1_1", label: "<a href='../php/link_1.php'><img src='../images/icons/choose2.png' width='18' height='18' alt='' style='position:relative;left:-9px;top:3px' />Artikel tauschen</a>", offsetTop: 5, className: "thema"},
				  {type: "label", name: "field1_2", label: "<a href='../php/link_2.php'><img src='../images/icons/choose2.png' width='18' height='18' alt='' style='position:relative;left:-9px;top:3px' />Bedarfsanfrage</a>", className: "thema"}
				  <?php } ?>
				  
			   ]}
			];
						
			Form[1] = Layout[1].cells('a').attachForm(formdata);
	   }

Got it

{type: "label", name: "field1_1", label: "<a href='javascript:Layout[1].cells(\"b\").attachURL(\"../link_1.php\");'><img src='../images/icons/choose2.png' width='18' height='18' alt='' style='position:relative;left:-9px;top:3px' />Artikel tauschen</a>", offsetTop: 5, className: "thema"},