function check_us(chk) 
{
    if (chk == 'user')
     var url ='validate_user.php?username='+ chk;
	if (chk == 'email')
	 var url ='validate_user.php?email='+ chk;
	
     var xmlHttp;       
     if(window.XMLHttpRequest) 
          xmlHttp = new XMLHttpRequest();
     else if(window.ActiveXObject) 
          xmlHttp = new ActiveXObject('Microsoft.XMLHTTP');
                  
     xmlHttp.onreadystatechange = function() {
          if (xmlHttp.readyState == 4 && xmlHttp.status == 200) {
               if (xmlHttp.responseText =='yes')                                                        
                    {document.getElementById('ch_user').innerHTML='השם בשימוש';  
					 a++;
					}
                 
           }
     }
     xmlHttp.open('POST', url, true);
     xmlHttp.send(null);   
}
function checkscript()
{
var a='0';
var n_pass = document.getElementById('pass').value;
var n_pass1 = document.getElementById('pass1').value;
if (n_pass != n_pass1)
{
document.getElementById('ch_pass').innerHTML='הסיסמאות לא תואמות';
document.getElementById('ch_pass1').innerHTML='';
document.getElementById('ch_pass').visibility='visible';
}
else
{
document.getElementById('ch_pass').innerHTML='';
document.getElementById('ch_pass1').innerHTML='';
a++;
}
 for (i=0;i<4;i++) 
	{   
	    var box  = document.register.elements;
		var aaa  = box.name;	
		var test = 'ch_' + aaa;
        test1 = document.getElementById(test);
    	  
		var filter1 = /^()+()+()+()+$/;
		if (aaa == 'user')
		{
		     check_us(aaa);
             
		     if (!(filter1.test(box.value)))
			    {test1.innerHTML='שם המשתמש לא חוקי';
				 test1.style.visibility='visible';}
			 else
			    {test1.innerHTML='';
			     a++;}
		}
		
		var filter  = /^()+\@(()+\.)+({2,4})+$/;
		if (aaa == 'email')
		{
		      if (!(filter.test(box.value)))
			    {
				test1.innerHTML='האימייל לא חוקי';
				test1.style.visibility='visible';
				}
			  else
			    {
				 test1.innerHTML='';
				 a++;
		        }
        }
		
	if (!box.value) 
		{   test1.innerHTML='חסר';
            test1.style.visibility='visible'; }
		else
		{   a++;}	
	}
	   
  	    if (a=='8')
		return true;
		else
		return false;
}