function checkForm(form)
{
	if(form == 'editlogin')
	{
		returnValue = false;
		
		if(document.editlogin.username.value == '' ||
		   document.editlogin.opassword.value == '' ||
		   document.editlogin.npassword.value == '' ||
		   document.editlogin.cpassword.value == '')
		{
			alert('please fill the required fields');
			returnValue = false;
		}
		else if( document.editlogin.npassword.value != document.editlogin.cpassword.value) {
			alert('please match your new password and confirmed password correctly.');
			returnValue = false;
		}
		else
		{
			returnValue = true;
		}
		
		return returnValue;
	}
	
	else if(form == 'register'){
		
		returnValue = false;
		
		if(document.register.username.value == '' ||
		   document.register.password.value == '' ||
		   document.register.name.value == '' ||
		   document.register.year.value == '' ||
		   document.register.head_office.value == '')
		{
			alert('please fill the required fields');
			returnValue = false;
		}
		
		else
		{
			returnValue = true;
		}
		
		return returnValue;
	}
	
	else if(form == 'productupload'){
		
		returnValue = false;
		
		if(document.productupload.prodname.value == '')
		{
			alert('please fill the required fields');
			returnValue = false;
		}
		
		else
		{
			returnValue = true;
		}
		
		return returnValue;
	}
	
}