function lockStep1()
    {
        
      if(document.regForm.step1[0].checked==true)
      {
  	    document.regForm.step1[3].disabled = true;
  	    document.regForm.step1[4].disabled = true;
  	    document.regForm.step1[5].disabled = true;
  	    document.regForm.step1[6].disabled = true;
  	    document.regForm.step1[7].disabled = true;
  	    
  	    document.regForm.step2[0].disabled = false;
  	    document.regForm.step2[1].disabled = false;
  	    document.regForm.step2[2].disabled = true;
  	    document.regForm.step2[3].disabled = true;
  	    document.regForm.step2[4].disabled = false;
  	    document.regForm.step2[5].disabled = false;
  	    document.regForm.step2[6].disabled = true;
  	    document.regForm.step2[7].disabled = true;
  	    document.regForm.step2[8].disabled = false;
  	    document.regForm.step2[9].disabled = true;
  	    document.regForm.step2[10].disabled = true;
  	    document.regForm.step2[11].disabled = true;
  	    document.regForm.step2[12].disabled = true;
  	    document.regForm.step2[13].disabled = true;
  	    
  	    document.regForm.children_step1.disabled = true;
  	    document.regForm.step2_children_b3.disabled = true;
  	    document.regForm.step2_children_a4.disabled = true;
  	    document.regForm.step2_children_a5.disabled = true;
		document.regForm.step2_children_a6.disabled = true;
      }
      else if(document.regForm.step1[1].checked==true)
      { 
      	document.regForm.step1[3].disabled = true;
  	    document.regForm.step1[4].disabled = true;
  	    document.regForm.step1[5].disabled = true;
  	    document.regForm.step1[6].disabled = true;
  	    document.regForm.step1[7].disabled = true;
  	         
  	    document.regForm.step2[0].disabled = true;
  	    document.regForm.step2[1].disabled = true;
  	    document.regForm.step2[2].disabled = false;
  	    document.regForm.step2[3].disabled = true;
  	    document.regForm.step2[4].disabled = true;
  	    document.regForm.step2[5].disabled = true;
  	    document.regForm.step2[6].disabled = false;
  	    document.regForm.step2[7].disabled = false;
  	    document.regForm.step2[8].disabled = true;
  	    document.regForm.step2[9].disabled = false;
  	    document.regForm.step2[10].disabled = true;
  	    document.regForm.step2[11].disabled = true;
  	    document.regForm.step2[12].disabled = true;
  	    document.regForm.step2[13].disabled = false;
  	    
  	    document.regForm.children_step1.disabled = true;
  	    document.regForm.step2_children_b3.disabled = true;
  	    document.regForm.step2_children_a4.disabled = true;
  	    document.regForm.step2_children_a5.disabled = true;
		document.regForm.step2_children_a6.disabled = true;
      }
      else if(document.regForm.step1[2].checked==true)
      {      
      	document.regForm.step1[3].disabled = true;
  	    document.regForm.step1[4].disabled = true;
  	    document.regForm.step1[5].disabled = true;
  	    document.regForm.step1[6].disabled = true;
  	    document.regForm.step1[7].disabled = true;
  	    
  	    document.regForm.step2[0].disabled = true;
  	    document.regForm.step2[1].disabled = true;
  	    document.regForm.step2[2].disabled = true;
  	    document.regForm.step2[3].disabled = false;
  	    document.regForm.step2[4].disabled = true;
  	    document.regForm.step2[5].disabled = true;
  	    document.regForm.step2[6].disabled = true;
  	    document.regForm.step2[7].disabled = true;
  	    document.regForm.step2[8].disabled = true;
  	    document.regForm.step2[9].disabled = true;
  	    document.regForm.step2[10].disabled = false;
  	    document.regForm.step2[11].disabled = false;
  	    document.regForm.step2[12].disabled = false;
  	    document.regForm.step2[13].disabled = true;
  	    
  	    document.regForm.children_step1.disabled = false;
  	    document.regForm.step2_children_b3.disabled = false;
   	    document.regForm.step2_children_a4.disabled = false;
  	    document.regForm.step2_children_a5.disabled = false;
		document.regForm.step2_children_a6.disabled = false;
      }
      else if(document.regForm.step1[7].checked==true || document.regForm.step1[3].checked==true || document.regForm.step1[4].checked==true || document.regForm.step1[5].checked==true || document.regForm.step1[6].checked==true)
      {      
      	document.regForm.step1[0].disabled = true;
  	    document.regForm.step1[1].disabled = true;
  	    document.regForm.step1[2].disabled = true;
  	    
  	    document.regForm.step2[0].disabled = true;
  	    document.regForm.step2[1].disabled = true;
  	    document.regForm.step2[2].disabled = true;
  	    document.regForm.step2[3].disabled = true;
  	    document.regForm.step2[4].disabled = true;
  	    document.regForm.step2[5].disabled = true;
  	    document.regForm.step2[6].disabled = true;
  	    document.regForm.step2[7].disabled = true;
  	    document.regForm.step2[8].disabled = true;
  	    document.regForm.step2[9].disabled = true;
  	    document.regForm.step2[10].disabled = true;
  	    document.regForm.step2[11].disabled = true;
  	    document.regForm.step2[12].disabled = true;
  	    document.regForm.step2[13].disabled = true;
		document.regForm.children_step1.disabled = true;
  	    document.regForm.step2_children_b3.disabled = true;
  	    document.regForm.step2_children_a4.disabled = true;
  	    document.regForm.step2_children_a5.disabled = true;
		document.regForm.step2_children_a6.disabled = true;
      }
    }