Swapping Images using javascript

I want to create an image similar to this : http://www.returnloads.net/loads.asp?area=12

Loading the images dynamically from a database, i.e. 1 main image and then depending on the area the mouse rolls over in the map overlay one of four images would be loaded to replace the original one. again when the mouse rolls off the image the original image is returned.  I've tried using the attached codebehind  BUT it's not working because of the syntax problems associated with the javascript and the ' quotes.

        Image7.Attributes.Add("usemap", "#map1")
        Dim Mainimg As String = "main.jpg"
        Dim img1 As String = "graphics/a.gif"
        Dim img2 As String = "graphics/b.jpg"
        Dim img3 As String = "graphics/c.gif"
        Dim img4 As String = "graphics/d.gif"

        Litadvert.Text &= "<map name='Map1' id='Map1'>"
        Litadvert.Text &= "<area shape='rect' coords='2,1,123,108' href='' onmouseover='javascript:ctl00_CPHReturnLoadsAdvert_Image7.src='" & img1 & "'' onmouseout='javascript:ctl00_CPHReturnLoadsAdvert_Image7.src='" & mainimg &"'"/>"
        Litadvert.Text &= "<area shape='rect' coords='134,1,259,108' href='' onmouseover=javascript:ctl00_CPHReturnLoadsAdvert_Image7.src='" & img2 & "' onmouseout='MM_swapImgRestore()'/>"
        Litadvert.Text &= "<area shape='rect' coords='269,1,394,108' href='' onmouseover='javascript:ctl00_CPHReturnLoadsAdvert_Image7.src='" & img3 & "'' onmouseout='javascript:ctl00_CPHReturnLoadsAdvert_Image7.src='" & mainimg &"'"/>"
        Litadvert.Text &= "<area shape='rect' coords='405,1,525,108' href='' onmouseover='javascript:ctl00_CPHReturnLoadsAdvert_Image7.src='" & img4 & "'' onmouseout='javascript:ctl00_CPHReturnLoadsAdvert_Image7.src='" & mainimg &"'"/>"
        Litadvert.Text &= "</map>"

Where mainimg and img1 etc would in reality be loaded from a database,

This is giving syntax errors and the mouseover evnt isn't working.

Can anyone suggest a way of fixing this or an alternative to do the same thing?
markejAsked:
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Carl TawnSystems and Integration DeveloperCommented:
It looks like it is just a syntactic issue because of the quotes. Try it as:
 Litadvert.Text &= "<area shape=""rect"" coords=""2,1,123,108"" href="""" onmouseover=""javascript:ctl00_CPHReturnLoadsAdvert_Image7.src='" & img1 & "'"" onmouseout=""javascript:ctl00_CPHReturnLoadsAdvert_Image7.src='" & mainimg & "'"" />"

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You might need to stick a few spaces in there to check for yourself which are quotes and which are apostrophes :)
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markejAuthor Commented:
Great it works, thanks for the help
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