AppendChild getElementsByName onclick

function Add_Item() {     

 var table = document.getElementById("tb_devis");
     var rowCount = table.rows.length;
     var row = table.insertRow(rowCount);
     window.status="rowCount="+rowCount;
     var cell1 = row.insertCell(0);
     cell1.innerHTML = rowCount;
                                                        
var namer=new Array("Item","Qantite","Prix HT","Total");
var fonct=new Array("function (){call();}","javascript:alert();","javascript:Add_Item();","");

for (i=1;i<=namer.length;i++) {
     var cell2 = row.insertCell(i);
     if (document.all){  // pour IE                            
        var element1 = document.createElement("<input name='"+namer[i-1]+"'>");
        }
        else{ // pour FF et autres navigateurs
        var element1 = document.createElement("input"); 
        element1.name=namer[i-1];
        }
     element1.type = "text";
     element1.value=element1.name;
     element1.onclick = fonct[i-1];//function(){alert();}; // de cette facon OK
     cell2.appendChild(element1);
}

var cell1 = row.insertCell(namer.length+1);
     cell1.innerHTML  = '<a style="cursor:pointer;" onclick="javascript:Add_Item();">'
     cell1.innerHTML += '<img src="./Include/add.jpg" title="add" width="20" height="20" align="middle" border="0" />';
     cell1.innerHTML += '</a>';

     var tmp_name = document.getElementsByName(namer[0])[rowCount-1];
     tmp_name.value=document.getElementsByName(namer[0]).length;
     tmp_name.onclick=fonct[0]; // mais pas de celle la 
 }