Javascript invalid assign left hand side -

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possible duplicate:
invalid assignment left-hand side, javascript 

                   var htmltoadd = '<label for="a'+indexnr+'" class="pricelabel">min</label>'                                 += '<input style="width:3em" name="b'+indexnr+'" id="b'+indexnr+'" type="text"  />'                                 += '<label for="c'+indexnr+'" class="maxpricelabel">max</label>'                                 += <input style="width:3em" name="d'+indexnr+'" id="d'+indexnr+'" type="text"  />';

i trying create html string , use append html element. firebug giving me

invalid assignment left-hand side

    [break on error] += '<input style=...rcentage'+indexnr+'" type="text" />'

replace += +

+= means "take variable on left, append on right it, assign variable" … have string left of each one, not variable.


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