jQuery substring function

Hello Experts,

I have this short script below. For some reason only the line with the "substring" function creates and error. The error in the console is very long and looks as if there is a problem with the function. Can it be that i have to declare or convert the variable type before i use the "substring" function? As soon as i remove the "substring(4);" from line 3 in the code below there is no error.

$('.table tr').hover(function() {	
    var floorPlan = $(".td:eq(2)", this).text();		
    var floorImage = $("#viewimage > div").attr("id").substring(4);
    
    $("#viewimage > div img").css("visibility", "hidden");		
    $("#plan"+floorImage).find("img").css("visibility", "visible");

});

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RefaelAsked:
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leakim971PluritechnicianCommented:
$('.table tr').hover(function() {	
    var floorPlan = $(".td:eq(2)", this).text();		
    var floorImageStr = $("#viewimage > div").attr("id");
    floorImage = (floorImageStr || "").substring(4); // if the ID attribute is not set you get undefined and an error
    $("#viewimage > div img").css("visibility", "hidden");		
    $("#plan"+floorImage).find("img").css("visibility", "visible");

});

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RefaelAuthor Commented:
leakim971, Thank you. Always!
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