function CheckSelect(objSel)
	{
		if(objSel.selectedIndex != -1)
		{
			if(objSel.options[objSel.selectedIndex].value == "null")
				return false;
		}
		return true;
	}

	function CheckText(objSel)
	{
		if(objSel.value == "")
			return false;
		return true;
	}
	
	function CheckRadio(objRadio1, objRadio2)
	{
		
		if(objRadio1.checked==true || objRadio2.checked==true)
			return true;
		return false;
	}
	
	function MuiltyCheckRadio(nameRadio, col)
	{
		for (var i = 1; i<= col; i++)
		{
			var objRadio = document.getElementById(nameRadio+i);
			if(objRadio.checked==true)
				return true;
		}
		return false;
	}

	function CheckPhone(objSel, req)
	{
		if(objSel.value == "" && req == 1)
			return false;
		var reg= new RegExp("^[0-9]*$");
		
		if (!reg.test(objSel.value)) 
       			return false;
		return true;
	}

	function CheckMail(objName,objHost,req)
	{
		if(req ==1 && (objName.value == "" || objHost.value == ""))
			return false;
		
		user_work_email = objName.value+"@"+objHost.value;
		
		var reg= new RegExp("^[a-z][0-9a-z\._]*@([0-9a-z\._]+\.)+[a-z]{2,3}$", "i");
		
		if (!reg.test(user_work_email))
			return false;
		
		return true;
	}

	function CheckPasswordLength(password1,password2){		
		if (password1.value.length<6 || password2.value.length<6)
			return false;
		return true;
	}

	function CheckPasswordCompare(password1,password2){		
		if (password1.value != password2.value)
			return false;
		return true;
	}

	function CheckLogin(objLogin)
	{
		if(objLogin.value == "")
			return false;

		var reg= new RegExp("[a-z][0-9a-z_\.]*$","i");
		if (!reg.test(objLogin.value)) 
			return false;

		return true;
	}

	function CheckPDF(objLogin)
	{
		if(objLogin.value != "")
		{
			
			var reg= new RegExp(".pdf$","i");
			if (!reg.test(objLogin.value)) 
				return false;
		}
		return true;
	}

	function CheckCatalog()
	{
		if(aCategory.length == 0)
			return false;
		return true;	
	}

	function IsChecked(element)
	{
		if(!element.checked)
			return false;
		return true;
	}