function selectColumnCheckbox(form, type) {
       	var deleteButton = document.getElementById('delete_button');
   		var removeButton = document.getElementById('remove_button');
  	 	var exportButton = document.getElementById('export_button');
  	 	
       var columnCheckBox = 'selected_' + type;
       var checked = document.getElementById(columnCheckBox).checked;

       if (deleteButton != null) {
           deleteButton.disabled = !checked;
       }
       if (removeButton != null) {
           removeButton.disabled = !checked;
       }
       if (exportButton != null) {
           exportButton.disabled = !checked;
       }
       with(form) {
           for(var i=0;i < elements.length;i++) {
               var thiselm = elements[i];
               var testString = columnCheckBox + '_';
               if(thiselm.id.indexOf(testString) != -1)
                   thiselm.checked = checked;
           }
       }
   }
   

   function setDeleteDisabledness(form, type) {

       	var deleteButton = document.getElementById('delete_button');
   		var removeButton = document.getElementById('remove_button');
  	 	var exportButton = document.getElementById('export_button');

       var checkBoxPrefix = 'selected_' + type + '_';
       var deleteDisable = true;
       var columnCheckBoxChecked = true;
       with(form) {
        	
           for(var i=0;i < elements.length;i++) {
               var thiselm = elements[i];
             
               if (thiselm.id.indexOf(checkBoxPrefix) != -1) {
                   if (thiselm.checked) {
                       deleteDisable = false;
                   } else {
                       columnCheckBoxChecked = false;
                   }
               }
           }
       }
       if (deleteButton != null) {
           deleteButton.disabled = deleteDisable;
       }
       if (removeButton != null) {
           removeButton.disabled = deleteDisable;
       }
       if (exportButton != null) {
           exportButton.disabled = deleteDisable;
       }
       document.getElementById('selected_' + type).checked = columnCheckBoxChecked;
       return true;
   }
   

  function noenter() {
    return !(window.event && window.event.keyCode == 13);
  }