function clear_years() {
// if user chooses a period other than
// "year selection", we want to clear out
// the checkboxes for individual years.
  var frm = document.forms[0];

  for(var i = 0; i < frm.year.length; i++) {
     frm.year[i].checked = false;
  }

  return true;
}

function set_period(index) {
// sets a specific radio button from
// the "period" group to "checked".
// Specifically, can be used to set period to
// "Year Selection", which is idx '4' for WoS,
// when a year is clicked on the form.

   document.forms[0].period[index].checked = true;
   return true;
}


function select_week_button(idx)
  {
  //if(idx==undefined) idx=0;
  if(! idx.length) idx=0;

  document.forms[0].period[idx].checked= true;
  return true;
  }

function select_year_button(idx)
  {
  // catch exception. In case wrong index is specified or element 'period' not  
  // available and the browser is not forgiving, other function which is called 
  // after this will not get executed.
  try {
   if(! idx.length) idx=1;
    document.forms[0].period[idx].checked= true;
   } catch (e) {
    ;
   }

   return true;
  }

function select_year_range_button(idx)
  {
  //if(idx==undefined) idx=2;
  if(! idx.length) idx=2;

  document.forms[0].period[idx].checked= true;
  return true;
  }

function check_start_and_end_years(idx)
  {
  //if(idx==undefined) idx=2;
  if(! idx.length) idx=2;

  if (document.forms[0].period[idx].checked == true && 
      document.forms[0].startYear.value > document.forms[0].endYear.value) 
    {
    // alert('The start year should not be later than the end year.\nThey are switched.');
    var tmp=document.forms[0].startYear.value;
    document.forms[0].startYear.value=document.forms[0].endYear.value;
    document.forms[0].endYear.value=tmp;
    return false;
    } 

//  var edition_count=0; 
//  for (var i=0; i<document.forms[0].editions.length; i++)
//    { 
//    if (document.forms[0].editions[i].checked == true)
//      {
//      edition_count++;
//      }
//    }
//  if (edition_count ==0)
//    {
//    alert('Your have to select at least one database.');
//    return false;
//    }
//
   return true;
   }

// WoS 6.0 addition.
function check_if_chem_selected(){
      for( var i=0; i<document.forms[0].chem_editions.length; i++){
              if(document.forms[0].chem_editions[i].checked == true){
                      return 1;
              }
      }
      return 0;
}

function check_if_bib_selected(){
      for( var i=0; i<document.forms[0].editions.length; i++){
              if(document.forms[0].editions[i].checked == true){
                      return 1;
              }
      }
      return 0;
}

function check_if_editions_selected (){
      for( var i=0; i<document.forms[0].editions.length; i++){
              if(document.forms[0].editions[i].checked == true){
                      return 1;
              }
      }
      for( var i=0; i<document.forms[0].fakeEditions.length; i++){
              if(document.forms[0].fakeEditions[i].checked == true){
                      return 1;
              }
      }
      return 0;
}

// Dynamically displays the current limit settings when the limits are hidden
function set_current_settings(timespanLabel, databasesLabel)
{
  try {
	var content=document.getElementById('db_timespan_current_settings');
	var currentSettingsArray = new Array();
	var timespanText;
	var databaseText;
	var periodSelected = false;
	
	// temporary hack to get rid of javascript popup error on dissimilar search pages
	if(!document.getElementById('showLimits')) {
		return false;
	}
	
	// First period option -- week selection
	if(document.forms[0].period[0].checked == true){
		var idx = document.forms[0].range.selectedIndex;
		timespanText = timespanLabel + "=" + document.forms[0].range[idx].text;
		periodSelected = true;
    }
	else if (document.forms[0].period[1].checked == true) {
		var idxSY = document.forms[0].startYear.selectedIndex;
		var idxEY = document.forms[0].endYear.selectedIndex;
		
		try{
			var stYear = document.forms[0].startYear[idxSY].text;
			var enYear = document.forms[0].endYear[idxEY].text;
			
			var stYearInt = document.forms[0].startYear[idxSY].value - 0;
			var enYearInt = document.forms[0].endYear[idxEY].value - 0;
			
			if (stYearInt < enYearInt){
				if (enYear.indexOf("-") != -1)
					enYearInt = enYear.substring(enYear.indexOf("-") + 1) - 0;
				timespanText = timespanLabel + "=" + stYearInt + "-" + enYearInt;
			}
			else if (stYearInt > enYearInt){
				if (stYear.indexOf("-") != -1)
					stYearInt = stYear.substring(stYear.indexOf("-") + 1) - 0;
				timespanText = timespanLabel + "=" + enYearInt + "-" + stYearInt;
			}
			else{ // stYear equals enYear
				if (stYear.indexOf("-") != -1)
					stYearInt = stYear;
				timespanText = timespanLabel + "=" + stYearInt;
			}
			periodSelected = true;
		}catch(e){
			;
		}	
	}

	if (periodSelected == true) {
		currentSettingsArray.push(timespanText);
	}
	
	// Get selected editions
	var editionArray = new Array();
	var editionSelected = false;
	
	if (document.forms[0].fakeEditions != null)
    {
	    for( var i=0; i<document.forms[0].fakeEditions.length; i++){
	    	if(document.forms[0].fakeEditions[i].checked == true) {
	    		//alert("fakeEditions alias value: "+i+": "+document.forms[0].fakeEditions[i].value);
	    		//alert("fakeEditions name value: "+document.getElementById(alias + '_name').value);
	      		var alias = document.forms[0].fakeEditions[i].value;
	      		var name = document.getElementById(alias + '_name').value;
	      	    editionArray.push(name);    			    		
	    		editionSelected = true;
	        }
	    }
	}
	else {
  
	    if (document.forms[0].editions != null)
	    {
		    for( var i=0; i<document.forms[0].editions.length; i++){
		    	if(document.forms[0].editions[i].checked == true) {
		      		var alias = document.forms[0].editions[i].value;
		      		var name = document.getElementById(alias + '_name').value;
		      	    editionArray.push(name);    			    		
		    		editionSelected = true;
		        }
		    }
		}
	}
	
	if (editionSelected == true) {
    	databaseText = databasesLabel + "=" + editionArray.join("; ");
   	    currentSettingsArray.push(databaseText);
    }
    
	content.innerHTML = currentSettingsArray.join(". <br>");
  } catch (e) {
    return true;
  }
  
}
// Dynamically displays the current limit settings when the limits are hidden for WCI only
function WCI_set_current_settings(timespanLabel, databasesLabel)
{
  try {
	var content=document.getElementById('db_timespan_current_settings');
	var currentSettingsArray = new Array();
	var timespanText;
	var databaseText;
	var periodSelected = false;
	
	// temporary hack to get rid of javascript popup error on dissimilar search pages
	if(!document.getElementById('showLimits')) {
		return false;
	}
	
	// First period option -- week selection
	if(document.forms[0].period[0].checked == true){
		var idx = document.forms[0].range.selectedIndex;
		timespanText = timespanLabel + "=" + document.forms[0].range[idx].text;
		periodSelected = true;
    }else if (document.forms[0].period[1].checked == true) {
		timespanText = timespanLabel + "=" +document.forms[0].WCIEntDBvalue.value;
		periodSelected = true;
	}

	if (periodSelected == true) {
		currentSettingsArray.push(timespanText);
	}
	
	// Get selected editions
	var editionArray = new Array();
	var editionSelected = false;
	
	if (document.forms[0].fakeEditions != null)
    {
	    for( var i=0; i<document.forms[0].fakeEditions.length; i++){
	    	if(document.forms[0].fakeEditions[i].checked == true) {
	    		//alert("fakeEditions alias value: "+i+": "+document.forms[0].fakeEditions[i].value);
	    		//alert("fakeEditions name value: "+document.getElementById(alias + '_name').value);
	      		var alias = document.forms[0].fakeEditions[i].value;
	      		var name = document.getElementById(alias + '_name').value;
	      	    editionArray.push(name);    			    		
	    		editionSelected = true;
	        }
	    }
	}
	else {
  
	    if (document.forms[0].editions != null)
	    {
		    for( var i=0; i<document.forms[0].editions.length; i++){
		    	if(document.forms[0].editions[i].checked == true) {
		      		var alias = document.forms[0].editions[i].value;
		      		var name = document.getElementById(alias + '_name').value;
		      	    editionArray.push(name);    			    		
		    		editionSelected = true;
		        }
		    }
		}
	}
	
	if (editionSelected == true) {
    	databaseText = databasesLabel + "=" + editionArray.join("; ");
   	    currentSettingsArray.push(databaseText);
    }
    
	content.innerHTML = currentSettingsArray.join(". ");
  } catch (e) {
    return true;
  }
  
}