function chNumber(e, skipAlerts)
 {
        var curText = document.traitel_phone_form.phonenumber.value;
        var nText = curText.replace(/[^0-9]/,'');
        document.traitel_phone_form.phonenumber.value = nText;
		
		if (e)
		{
	        keynum=0;		
	        if(window.event) // IE
	        {
	          keynum = e.keyCode;
	        }
	        else if(e.which) // Netscape/Firefox/Opera
	        {
	          keynum = e.which;
	        }
	        if (keynum>0)
	        {
	                keychar = String.fromCharCode(keynum);
	                curText=curText + keychar;
	        }
	        // check rules
		}
        pass=0;

        if (curText.length>=4 && !skipAlerts)
        {
                if (curText.substr(2,4) == "5551" && !skipAlerts)
                        alert("Numbers in the " + curText + " block cannot be called.");
                else if (curText.substr(2,4) == "7010" && !skipAlerts)
                        alert("Numbers in the " + curText + " block cannot be called.");
                else if (curText.substr(0,2) == "19" && !skipAlerts)
                        alert("Numbers in the "  + curText + " block cannot be called.");

                else if (curText.substr(0,2) == "02")
                { if (curText.length==10) pass=1; }
                else if (curText.substr(0,2) == "03")
                { if (curText.length==10) pass=1; }
                else if (curText.substr(0,2) == "04")
                { if (curText.length==10) pass=1; }
                else if (curText.substr(0,2) == "05")
                { if (curText.length==10) pass=1; }
                else if (curText.substr(0,2) == "07")
                { if (curText.length==10) pass=1; }
                else if (curText.substr(0,2) == "08")
                { if (curText.length==10) pass=1; }
                else if (curText.substr(0,4) == "1345")
                { if (curText.length==8) pass=1; }
                else if (curText.substr(0,4) == "1300")
                { if (curText.length==10) pass=1; }
                else if (curText.substr(0,2) == "13")
                { if (curText.length==8) pass=1; }
                else if (curText.substr(0,4) == "1800")
                { if (curText.length==10) pass=1; }
                else if (curText.substr(0,3) == "180")
                { if (curText.length==7) pass=1; }
                else
                {
                        alert("Please enter your area code");
                        document.traitel_phone_form.phonenumber.value="";
                        pass=-1
                }
                if (pass==1)
			submitOk=false;
        }
        if (pass!=1)
		submitOk=true;

        return pass;
 }