function checkch(pass){
if(pass==1)
{
field=document.book.name.value;
target=book.name;
var msg="Please remove numbers & special characters from the name field!"
}

if(pass==2)
{
field=document.book.surname.value;
target=book.surname;
var msg="Please remove numbers & special characters from the name field!"
}

if(pass==3)
{
field=document.book.cname.value;
target=book.cname;
var msg="Please remove numbers & special characters from the name field!"
}



		var notvalid;
		for (var i=0, notvalid="0123456789!@#$%^&*()+=-[]\\\';,./{}|\":<>?"; i<field.length; i++)
		{
       		if (notvalid.indexOf(field.charAt(i)) != -1)
		{
			alert(msg);
			target.focus(); 
			return false;
		}
		}
		

}


function checkem(){
var cemail=document.book.cemail.value;
if (cemail.length > 1 )
{

if(cemail.indexOf('_@')!=-1 || cemail.indexOf('@_')!=-1 || cemail.indexOf('_.')!=-1 || cemail.indexOf('-@')!=-1 || cemail.indexOf('@-')!=-1 || cemail.indexOf('-.')!=-1)
{
alert("Please input a valid email address!\n\n Ex: me@noname.com");
book.cemail.focus();
return false;
}

var filter=/^([\w-]+(?:\.[\w-]+)*)@((?:[\w-]+\.)*\w[\w-]{0,66})\.([a-z]{2,6}(?:\.[a-z]{2})?)$/i

if (filter.test(cemail))
return true;
else
{
alert("Please input a valid email address!\n\nEx: me@noname.com");
book.cemail.focus();
return false;
}
}
}

function checkn(num){

if(num==1)
{
field=document.book.cphone.value;
target=book.cphone;
var msg="PLease use only (+) signs!\nand do not enter less then 7 digits!"
}

if(num==2)
{
field=document.book.ext.value;
target=book.ext;
var msg="PLease use only (+) signs for extension field!"
}

var notvalid;
		for (var i=0, notvalid="abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ!@#$%^&*()=-[]\\\';,./{}|\":<>?"; i<field.length; i++)
		{
       		if (notvalid.indexOf(field.charAt(i)) != -1)
		{
			alert(msg);
			target.focus(); 
			return false;
		}
		}
		if(num==1)
{
		if ( field.length < 7 ) {
			alert(msg);
			target.focus(); 
			return false;
		}
}
}



function checks() 
{
 var msg="(*)Lütfen giriniz...\n\n";
if ( document.book.name.value.length < 1 ) {
				msg +="Adiniz!\n";
				}
if ( document.book.surname.value.length < 1 ) {
				msg +="Soyadiniz!\n";
				}
if ( document.book.location.value == 'loc' ) {
				msg +="Bölgeniz!\n";
				}
if ( document.book.dept.value.length < 1 ) {
				msg +="Istenilen Bölüm!\n";
				}
if ( document.book.cphone.value.length < 1 ) {
				msg +="GSM!\n";
				}	
if ( document.book.cemail.value.length < 1 ) {
				msg +="E-posta Adresiniz!\n";
				}
			
	if(msg=="(*)Lütfen giriniz...\n\n") 
        { 
            
			if (checkch(1)==false)
			return false;
			if (checkch(2)==false)
			return false;
			if (checkch(3)==false)
			return false;
			if (checkch(4)==false)
			return false;
			else if (checkn(1)==false)
			return false;
			else if (checkem()==false)
			return false;
			else
			return true;
			
        } 
        else 
        { 
            alert(msg); 
            return false; 
        }
}