Custom Form in Custom List SharePoint 2007 SP Designer

Hi,
perhaps this helps:
http://blog.slalom.com/2011/02/02/extending-the-size-of-the-rich-text-editor/

HTH
Rainer

open the page in SPD put the cursor in the multi line text box check the code view. it might have a  CSS class associated with it,
 then override the class like this

<style>
.ms-long{width:100px;}
</style>

it already had a STYLE so tried

.style4 {
                        background: #FCFCFC;
                        width: 450px;
}

did not work

This is an example of the code for one of the text boxes

<td valign="top" class="style4" style="width: 75%">
    <SharePoint:FormField runat="server" id="ff5{$Pos}" ControlMode="New" FieldName="Account_x002f_Client" __designer:bind="{ddwrt:DataBind('i',concat('ff5',$Pos),'Value','ValueChanged','ID',ddwrt:EscapeDelims(string(@ID)),'@Account_x002f_Client')}"/>                  
    <SharePoint:FieldDescription runat="server" id="ff5description{$Pos}" FieldName="Account_x002f_Client" ControlMode="New"/>
</td>

I tried this and now the toolbar about the text box is extended but not the actual text box

                                    <td valign="top" class="style4" style="width: 75%">
                            <style>
                                                  .ms-long{width:500px;}
                                          </style> <SharePoint:FormField runat="server" id="ff5{$Pos}" ControlMode="New" FieldName="Account_x002f_Client" __designer:bind="{ddwrt:DataBind('i',concat('ff5',$Pos),'Value','ValueChanged','ID',ddwrt:EscapeDelims(string(@ID)),'@Account_x002f_Client')}"/>
                            <style>
                                                  .ms-long{width:500px;}
                                          </style> <SharePoint:FieldDescription runat="server" id="ff5description{$Pos}" FieldName="Account_x002f_Client" ControlMode="New"/>
                                    </td>

do you have developer tools like firebug for Firefox or IE developer tools, if so try to find the css class of the text box from the tool and try changing the size.if possible else if you have the id may be some jquery works t change the size finding the id of the element.

try this

http://blogs.msdn.com/b/sharepointdesigner/archive/2008/01/25/modify-the-lengths-of-list-form-fields.aspx

http://www.graphicalwonder.com/?p=290

no do not have those, why is it so hard to increase the width of this element