function dateCheck(str){
        var re = new  RegExp("^([0-9]{4})[./]{1}([0-9]{2})[./]{1}([0-9]{2})$");
        var ar;
        var res = true;
       
        if ((ar = re.exec(str)) != null){
                var i;
                i = parseFloat(ar[1]);
                if (i <= 0 || i > 9999){
                        res = false;
                }
                i = parseFloat(ar[2]);
                  if (i <= 0 || i > 12){
                        res = false;
                }
                  i = parseFloat(ar[3]);
                if (i <= 0 || i > 31){
                        res = false;
                }
        }else{
                res = false;
        }
        return res;
}


function addItem(input){
	var td = input.parentNode;
	var tr  =  td.parentNode;
	var table = tr. parentNode;;
	var rows = table.rows;
	if(rows.length>=3)return;
	var rownum = 0;
	for(var i =0; i< rows.length;i++){
		var row = rows[i];
		if(row == tr){
			rownum =i;
			break;
		}
	}
	var html = '<input  type="text" name="" class="tdd1" size="48" />';
	html+='<input type="button" value="+" onclick="addItem(this)"/>'
	html   += '<input type="button" value="-" onclick="removeItem(this)"/>';
	var newtd = table.insertRow(rownum+1).insertCell(0);
	newtd.innerHTML = html;
	biuldName(rows);
}

function biuldName(rows){
	for(var index=0; index<rows.length; index++) {
		var row = rows[index];
		var cell = row.cells[0];
		var input = null;
		var children = cell.childNodes;
		for(var j=0; j<children.length; j++) {
			if(children[j].tagName && children[j].type=="text" ){
				children[j].name = "email_"+index;
				children[j].id = "email_"+index;
				
			}
		}
	}
}

function removeItem(input){
	var td = input.parentNode;
	var tr  =  td.parentNode;
	var table = tr. parentNode;;
	table.removeChild(tr);
	biuldName(table.rows);
}    

function download(name){
	var form = document.getElementById("downloadForm");
	document.getElementById("downloadname").value=name;
	alert(name);
	form.action='/pages/public/download.jspx?d=exercise';
	form.submit();
}