Hi Vinay,
If you want tooltip for lookup button then get the id and use the following , In the place of field_name
you can pass the lookup button id. In the Place of tooltip text
you can add what ever text you want.
You can call that function on onload.
document.getElementById("field_name").setAttribute("title", "tooltip text");
To modify a field label tooltip (which I believe all field types have), use the following Javascript:
document.getElementById("field_name_c").setAttribute("title", "tooltip text");
To modify a lookup button tooltip (lookup fields have two tooltips, one for the label and one for the button), use the following Javascript:
document.getElementById("field_name").setAttribute("title", "tooltip text");
The "_c" appended to the end of the internal name of the field stands for "caption", and is therefore associated with the label HTML element of that field. In the case of lookup fields specifically which have the second additional tooltip,
the exact internal name of the field matches the id of the lookup button HTML element.
Otherwise see this link, There you will get clarify.
http://stackoverflow.com/questions/9934482/is-it-possible-to-modify-crm-2011-tooltips.
If this is useful to then mark as a answer.
Thanks,
Sravan J
