javascript - Print Variable To Input Field Element -

hi have input , wondering how can print value based on it's id?

<input name="field[34]" id="field34" class="input-text required-entry validate-field-hint-34 webforms-fields-hint" style="" value="e.g: nx15 nam" onfocus="if (this.value == 'e.g: nx15 nam') {this.value = ''; $(this).removeclassname('webforms-fields-hint');}" onblur="if (this.value == '') {this.value = 'e.g: nx15 nam'; $(this).addclassname('webforms-fields-hint');}" type="text"> 

i have script takes value of url , turns variable. want print variable input field.

var querystring = function () {   // function anonymous, executed ,    // return value assigned querystring!   var query_string = {};   var query = window.location.search.substring(1);   var vars = query.split("&");   (var i=0;i<vars.length;i++) {     var pair = vars[i].split("=");         // if first entry name     if (typeof query_string[pair[0]] === "undefined") {       query_string[pair[0]] = decodeuricomponent(pair[1]);         // if second entry name     } else if (typeof query_string[pair[0]] === "string") {       var arr = [ query_string[pair[0]],decodeuricomponent(pair[1]) ];       query_string[pair[0]] = arr;         // if third or later entry name     } else {       query_string[pair[0]].push(decodeuricomponent(pair[1]));     }   }      return query_string; }(); 

any idea how can this?

thanks, nick

that simple, substitute below placeholder values actual values.

document.getelementbyid("yourelementid").value = yourvariablename; 

make sure dom loaded before trying this.

edit 1

document.addeventlistener("domcontentloaded", function() {     document.getelementbyid("yourelementid").value = yourvariablename; }, false);