html - dynamically creating a table and adding cells to the table through a function with Javascript -

i wondering how create function loop creates new cells / rows other loop call upon. function should return newrow should specified amount of cells. idea html code displays 3 images per row, if there 2 images needs 2 cells. first if / else statement.

here code far..

 var cells = document.getelementsbytagname('td');  var cell = '<td>' + cells[0].innerhtml + '</td>';  //console.log(cell);    document.getelementbyid('searchbtn').onclick = search;   //specified 3 per row  var numperrow = 3;   //gets number form text input  var num = document.getelementbyid("searchtxt").value;   function search(){  //var num = 4;  console.log(num);  //loop once per row var htmlstr = ''; (var = 0; < num; = + numperrow){      //htmlstr += '<tr>' + cell + cell + cell + '</tr>;     if (num - >= numperrow) {          //displays new row of 3          htmlstr += newrow(numperrow);      }else { //less 3 display          htmlstr += newrow(num - i);     }   }  document.getelementbyid('thumbnails').innerhtml = htmlstr;   } /* *returns html new row. * numtoadd: number of cells add row. * */ //this function not know how write  function newrow(cellstoadd){   /////?????????? should loop return new row for loop above  } 

}

here simple function if don't want pass values can leave content out.

function newrow(numberofcells, content) { var result = '<tr>'; for(var = 0; < numberofcells; i++)     result += '<td>' + content[i] + '</td>'; result += '</tr>'; return result; }