function checkForm(){

    var ckBoxesV = document.searchform['VariableID[]'];
    var ckOkV = false;
    var ckBoxesS = document.searchform['SiteID[]'];
    var ckOkS = false;
	
    for(var i=0; i< ckBoxesV.length; i++){
        if(ckBoxesV[i].checked == true){
            ckOkV = true;
            break;
        }
    }

    for(var i=0; i< ckBoxesS.length; i++){
        if(ckBoxesS[i].checked == true){
            ckOkS = true;
            break;
        }
    }
	
    if(ckOkV && ckOkS) {
        return true;
    }
    else {
        alert("Please select at least one site and one variable.");
        return false;
    }
}

function checkFormC(){

    var ckBoxesV = document.searchform['VariableID[]'];
    var ckOkV = false;
    var ckBoxesS = document.searchform['SiteID[]'];
    var ckOkS = false;
	
    for(var i=0; i< ckBoxesV.length; i++){
        if(ckBoxesV[i].checked == true){
            ckOkV = true;
            break;
        }
    }

    for(var i=0; i< ckBoxesS.length; i++){
        if(ckBoxesS[i].checked == true){
            ckOkS = true;
            break;
        }
    }
	
    if(ckOkV && ckOkS) {
        return true;
    }
    else {
        alert("Please select one site and one variable.");
        return false;
    }
}

function setallVar(b_checked)
 {
 var a_items = document.getElementsByName('VariableID[]');
 for(var i_count = 0 ; i_count < a_items.length; i_count++)
       {
       a_items[i_count].checked = b_checked;
       }
 }
 


function setallSit(b_checked)
 {
 var a_items = document.getElementsByName('SiteID[]');
 for(var i_count = 0 ; i_count < a_items.length; i_count++)
       {
       a_items[i_count].checked = b_checked;
       }
 }