Как при переборе массива к выбранным элементам присвоить тип - число

[Rich]

function t_equipment(name)
 {
  this.name = name;
 }
 
 var a_equipment = new Array();
 a_equipment[0] = new t_equipment("Классика")
 a_equipment[1] = new t_equipment("Боевики")
 a_equipment[2] = new t_equipment("Учебники") 
 
 function equipment(name, price, count, vsego, description, t_equipment)
 {
  this.name = name;   
  this.price = price;
  this.count = count; 
  this.vsego = vsego; 
  this.description = description;
  this.t_equipment = t_equipment;  
 } 
 
 var n_equipment = new Array();
 n_equipment[0] = new equipment("Мертвые души", parseFloat(300), "1", '300', "", a_equipment[0])
 n_equipment[1] = new equipment("Маршрут", parseFloat(258), "1", '258', "", a_equipment[1])
 n_equipment[2] = new equipment("Руский язык за 5 класс", parseFloat(250), "1", '250', "", a_equipment[2])
  
 var strTab = "<table id='equip' 'border='2' ><tr>"
 strTab += "<th> Наименование </th><th width=80px> Цена </th><th width=65px> Кол-во </th><th width=100px> Всего </th><th width=auto align=left > Описание </th><th width=200px align=left > Тип </th>"
 
 for(var i=0; i <= n_equipment.length - 1; i ++) 
 {
  strTab += "<TR><TD><h5>" + n_equipment[i].name + "</h5></TD><TD id=p align=center ><b>" + n_equipment[i].price 
  strTab += "</b></TD><TD align=center ><b>" + n_equipment[i].count + "</b></TD><TD align=center ><b>" + n_equipment[i].vsego 
  strTab += "</b></TD><TD><h5>" + n_equipment[i].description + "</h5></TD><TD><h5>" + n_equipment[i].t_equipment.name + "</h5></TD></TR>"
 } 
  
 strTab += "</table>" 
 document.write(strTab);
 
 strTab = "<table 'border='2' ><tr>"
    
 var count_pr = new Array();
 for( var j = 1; j < document.getElementById("equip").rows.length; j ++)
 {
  count_pr += document.getElementById("equip").rows[j].cells[3].innerText; 
  alert(parseFloat(document.getElementById("equip").rows[j].cells[3].innerText));  
 }
 
 alert(count_pr.innerText);
 pr = count_pr.innerText;
    
 strTab += "<tr><td align='right' width='190px' > Итого стоимость книг: </td><td align='center' width='80px'>"+ pr +"</td><td align='center' width='65'>руб.</td></tr>"
 strTab += "</table>" 
 
 document.write(strTab);

[Rich]

Тема закрыта. в чём была ошибка я выяснил.

var col = 0;
	 var count_pr = new Array();
	 for( var i = 1; i < document.getElementById("equip").rows.length; i ++)
	 {
	  count_pr = parseInt(document.getElementById("equip").rows[i].cells[3].innerHTML);
	  pr += count_pr;  
	 } 
	 strTab = "<table border='2' ><tr>"  
	 strTab += "<tr><td align='right' width='495px' >Кол-во: " + pr + "</td></tr>"
	 strTab += "</table>" 
 
	 comm.document.write(strTab);

надо было в цикле в код добавить строку

pr += count_pr;