Fiddle 2

HTML

<center><label id='foo1'>Daca publici zilnic <select name="textbox1" id="textbox1" size="1">
								<option value="1">10</option>
								<option value='2'>20</option>
								<option value="3">30</option>
								<option value="4">40</option>
								<option value="5">50</option>
								<option SELECTED value="6">60</option>
    </select> anunturi</label><input type="submit" value="Calculeaza Vizualizarile, inregistrarile si castigurile!" id="sbtBtn"/></center><br>
<label id='foo2'>La un minim de  <select name="textbox2" id="textbox2" size="1">
								<option value="1">1</option>
								<option value="2">5</option>
								<option value="3">10</option>
								<option value="4">15</option>
								<option value="5">20</option>
								<option value="6">50</option>
    <option SELECTED value="7"> </option>
    </select> vizualizari/anunt</label><br>
<label id='foo3'>Vei avea          <select name="textbox3" id="textbox3" size="1">
								<option value="1">10</option>
								<option value="2">20</option>
								<option value="3">30</option>
								<option value="4">40</option>
								<option value="5">50</option>
								<option value="6">60</option>
    <option SELECTED value="7"> </option>
    </select> vizualizari/anunt</label><br>
<label id='foo4'>Accesul fiind gratuit putem presupune ca se vor inregistra toti cei care vor vizualiza anuntul, asadar vei avea   <select name="textbox4" id="textbox4" size="1">
								<option value="1">10</option>
								<option value="2">20</option>
								<option value="3">30</option>
								<option value="4">40</option>
								<option value="5">50</option>
								<option value="6">60</option>
    <option SELECTED value="7"> </option>
    </select> inregistrari</label><br>
<label id='foo5'>Ceea ce inseamna ca vei avea minimum </label><select name="textbox5" id="textbox5" size="1">
								<option value="1">10</option>
								<option value="2">20</option>
								<option value="3">30</option>
								<option...

JavaScript

$('#sbtBtn').live('click',function(){
    var textBox1=document.getElementById('textbox1').value;
    var textBox2=document.getElementById('textbox2').value;
    var textBox3=document.getElementById('textbox3').value;
    var textBox1=document.getElementById('textbox4').value;
    var textBox2=document.getElementById('textbox5').value;
    var textBox3=document.getElementById('textbox6').value;
    var textBox1=document.getElementById('textbox7').value;
    var textBox2=document.getElementById('textbox8').value;

     if ((textBox1) = 10){
        $('#textbox2').val('1');
        $('#textbox3').val('1');
        $('#textbox4').val('1');  
        $('#textbox5').val('1');   
        $('#textbox6').val('1'); 
        $('#textbox7').val('1'); 
        $('#textbox8').val('1');
  return false;
    }else { ((textBox1) = 20){
        $('#textbox2').val('2');
        $('#textbox3').val('2');
        $('#textbox4').val('2');  
        $('#textbox5').val('2');   
        $('#textbox6').val('2'); 
        $('#textbox7').val('2'); 
        $('#textbox8').val('2'); 
        return false;
    }
});