cely ten javascript vyzera takto:

var id=0;
function addRow(tab) {                                      //vytvory novy riadok

            var table = document.getElementById(tab);
 
            var rowCount = table.rows.length;
            var row = table.insertRow(rowCount);
            var x=row.id='r'+id;                  //id riadku
            id=id+1;            
 
            var cell1 = row.insertCell(0);
            var element1 = document.createElement('input');
            element1.type = 'text';
            element1.name = id;
            element1.size = '4';
            element1.maxLength = 3;
            cell1.appendChild(element1);
 
            var cell2 = row.insertCell(1);
            cell2.innerHTML = rowCount;
            
            var cell3 = row.insertCell(2);
            var element2 = document.createElement('input');
            element2.type = 'text';
            element2.size = '4';
            cell3.appendChild(element2);
            
            var cell4 = row.insertCell(3);
            var element3 = document.createElement('input');
            element3.type = 'text';
            element3.size = '4';
            cell4.appendChild(element3);
            
            var cell5 = row.insertCell(4);
            var element4 = document.createElement('input');
            element4.type = 'text';
            element4.size = '5';
            cell5.appendChild(element4);
 
            var cell6 = row.insertCell(5);            
            cell6.innerHTML = 'aaa';
            
            var cell7 = row.insertCell(6);            
            cell7.innerHTML = 'aaa';
            
            var cell8 = row.insertCell(7);
            var element5 = document.createElement('input');
            element5.type = 'text';
            element5.size = '4';
            cell8.appendChild(element5);
            
            var cell9 = row.insertCell(8);            
            cell9.innerHTML = 'aaa';
            
            var cell10 = row.insertCell(9);            
            cell10.innerHTML = 'aaa';
            
            var cell11 = row.insertCell(10);
            var element6 = document.createElement('input');
            element6.type = 'text';
            element6.size = '7';
            cell11.appendChild(element6);
            
            var cell12 = row.insertCell(11);            
            cell12.style.border='none';
            var element7 = document.createElement('input');
            element7.type='button';
            element7.id= id;
            //element7.class = 'add';            
            var on='deleteRow("'+x+'")';             
            cell12.appendChild(element7);
            document.getElementById(element7.id).onclick= new Function(on);                                  
        }
        function deleteRow(id_row) {                          //zmaze riadok
            var element = document.getElementById(id_row);
            element.parentNode.removeChild(element); 
                                  
        }