function fchecker(elem, flag, type, eq_len, more_len){
	var checker = false;
	var leng = 3;
        
	if (type=='email'){
		if((elem.value.indexOf('@')!=-1) &&  (elem.value.indexOf('.')!=-1)){
			checker = true;
		}else{
			checker = false;
		}
	}
	if (type!='email'){
		if (eq_len != ''){
			if (elem.value!='' && elem.value.length==eq_len){
				checker = true;
			}else{
				checker = false;
			}
		}else{
			if (more_len!=''){
				leng = more_len;
			}
			if (elem.value!='' && elem.value.length>leng){
				checker = true;
			}else{
				checker = false;
			}
		}
	}
	if (checker){
		document.getElementById(flag).style.color = 'black';
		document.getElementById(flag).style.zindex = '10';
	}else{
		document.getElementById(flag).style.color = 'red';
		document.getElementById(flag).style.zindex = '255';
	}   
	formactivation();
}
      

function formactivation() {
	if (check_necessary()){
		//document.getElementById(btn_id).disabled = false;
		document.getElementById(btn_id).onclick = function(){ CheckFormFull();/*changeFormLook(_('OwnerType').value, true);*/ };
	}else{
		//document.getElementById(btn_id).disabled = true;
		document.getElementById(btn_id).onclick = function(){ CheckFormFull(); };
	}
}
      
function check_necessary() {
	var checker = true;
	for (var i=0; i<necessary_items.length; i++){
		if (document.getElementById(necessary_items[i]).style.zindex!='10') {
			checker = false;
		}
	}
	return checker;
}

function CheckUserPK(pk, num){
	var num = '01060307091005080402';
	var checksum = 1;

        pk = pk.replace(/-/i, '');

	for (var i=0; i<10; i++){
            checksum -= (pk.substr(i, 1)) * (num.substr(i * 2, 2));
	}

	if ((checksum - Math.floor(checksum / 11) * 11) != pk.substr(10, 1)) {
            return false;
	}
        else {
            return true;
	}
}