hiks 0 Newbie Poster

code function javascript to swapimage(img1)

var str1 = new String(img1);
var text = document.getElementById('<%=TextBox1.ClientID %>');
var arr = new Array();
arr = str1.split('/');
document.getElementById(textvalue).src = str1;
document.getElementById('<%=addProductImage.ClientID %>').src = "Images/ProductImages/thumb_" + arr[arr.length - 1];
document.getElementById('needToChange').href = str1;

question is .. when page load appear problem which is say
htmlfile: Invalid argument.