function Error_ID(obj) {	
	obj.focus();   	   	
}

function checkID( obj ) {
   var id = obj.value;
   tab = "ABCDEFGHJKLMNPQRSTUVWXYZIO"
   A1 = new Array (1,1,1,1,1,1,1,1,1,1,2,2,2,2,2,2,2,2,2,2,3,3,3,3,3,3 );
   A2 = new Array (0,1,2,3,4,5,6,7,8,9,0,1,2,3,4,5,6,7,8,9,0,1,2,3,4,5 );
   Mx = new Array (9,8,7,6,5,4,3,2,1,1);

   if ( id.length != 10 )	{ Error_ID(obj); return false;}
   i = tab.indexOf( id.charAt(0).toUpperCase());
   if ( i == -1 ) { Error_ID(obj); return false;}
   sum = A1[i] + A2[i]*9;

   for ( i=1; i<10; i++ ) {
      v = parseInt( id.charAt(i) );
      if ( isNaN(v) ) { Error_ID(obj); return false;}
      sum = sum + v * Mx[i];
   }
   if ( sum % 10 != 0 )	{ Error_ID(obj); return false;}
   return true;
}

function chk_Email(textin) {
	var chstr = textin.value;
 	if ( chstr != "" || (textin.getAttributeNode("notnull") != null && textin.getAttributeNode("notnull").value =="1") )
 	{
	var chname = chstr.substring(0, chstr.indexOf("@"));
	var chhost = chstr.substring(chstr.indexOf("@")+1, chstr.length);

	if(chstr.length <= 0)
	{
				textin.focus();		
		return  false;
	}
	else if(chstr.indexOf("@") < 0)
	{
				textin.focus();		
		return  false;
	}
	else if(chstr.indexOf(".") < 0)
	{
				textin.focus();		
		return  false;
	}
	else if((chhost.length <= 0) || (chname.length <= 0))
	{
				textin.focus();		
		return  false;
	}
	else if((chname.substring(0,1) == ".") || (chname.substring(chname.length-1, chname.length) == ".")||
			(chhost.substring(0,1) == ".") || (chhost.substring(chhost.length-1, chhost.length) == "."))
	{
				textin.focus();		
		return  false;
	}
	else if((chstr.indexOf("@@") >= 0) || (chstr.indexOf("@.") >= 0))
	{
				textin.focus();		
		return  false;
	}
	else 
		return  true;
	}
	else
		true
}

function isNumber(num) {
    var charset="0123456789";
    for (var i=0;i<num.length;i++) {
        if (charset.indexOf(num.charAt(i)) == -1)
            return(false);            
    }
    return(true);
}
 
 
/*
function chk_Email( EmailObj ) {
	if ( EmailObj != null  ) {		
		if ( EmailObj.value == "" ) {
			if ( EmailObj.notnull == "1" ) {
				if ( EmailObj.title != null && EmailObj.title !="" )
					alert(EmailObj.title);
				else
					alert("Please input your Email!");
				EmailObj.focus(); 
				return false;
			} else {
				return true;
			}
		} else {
			var szEmailObj = EmailObj.value;
			var valid = /^.+@.+\..{2,3}$/;
			var illChars = /[\[\]\<\>\;\:\"\(\)\,\/\\]/;
			
			if( !valid.test(szEmailObj) ) //|| s.match(illChars) )
			{
				if ( EmailObj.ErrorMsg )
					alert( EmailObj.ErrorMsg);
				else
					alert("Invalid Email Format!")     
				EmailObj.focus();
				return false
			}
		}
	} else {
		return false;
	}
}
*/


function chk(formname){
try{
	var k=formname.elements.length;	
	for(i=0;i<k;i++){
		var szTag = formname.elements[i].tagName;		
		switch ( szTag ) {
			case "INPUT":		
			//criteria : 
			//any input with an attribute "notnull=1" must not be empty
			//any E-mail field (has an attribute checkEmailFormat=1)must follow the rule
			//any Number field (has an attribute isnumber=1) must be numbers
			//any "SELECT" type input must be selected
				
				if ( ( formname.elements[i].type == "checkbox" || formname.elements[i].type == "radio" )&& ( formname.elements[i].getAttributeNode("notnull") != null && formname.elements[i].getAttributeNode("notnull").value =="1" ) ) {					
					var nSel=0;
					var obj_col = document.getElementsByName(formname.elements[i].name);					
					for (j=0;j<obj_col.length;j++){
						if ( obj_col[j].checked == true ) nSel++;
					}
					if ( nSel < 1 ){
						alert(obj_col[0].title);
						obj_col[0].focus();
						return false;
					}
				} else {
					var obj = formname.elements[i];
					if ( obj.value == "" && ( obj.getAttributeNode("notnull") != null && obj.getAttributeNode("notnull").value =="1" ) ) {
				
						if ( document.getElementById(obj.name + "_warn") != null )
							document.getElementById(obj.name + "_warn").style.display="block";
						else {
							if ( obj.title != null && obj.title != "")
								alert(formname.elements[i].title);
							else			
								alert("Please input data!");
						}
						obj.focus();
						return false;				
					} 				
					if ( formname.elements[i].name.indexOf("Email") >= 0 ||( formname.elements[i].getAttributeNode("checkEmailFormat") != null && formname.elements[i].getAttributeNode("checkEmailFormat").value =="1" ) ) {
						
						if ( chk_Email(formname.elements[i]) == false ) {
						if ( formname.elements[i].getAttributeNode("ErrMsg") != null )
							alert(formname.elements[i].getAttributeNode("ErrMsg").value);				
						else													
							alert("Please check your email format!")
							return false;
						}	
					}
					if ( ( formname.elements[i].getAttributeNode("isnumber") != null && formname.elements[i].getAttributeNode("isnumber").value =="1" ) ) { 
						if ( isNumber(formname.elements[i].value) == false ) {
							if ( formname.elements[i].getAttributeNode("ErrMsg") != null )
								alert(formname.elements[i].getAttributeNode("ErrMsg").value);
							else
								alert("Please input number only!");
								formname.elements[i].focus();
								return false;				
						}
					} 				
				}
				break;
			case "TEXTAREA":			
				if ( formname.elements[i].value == "" && ( formname.elements[i].getAttributeNode("notnull") != null && formname.elements[i].getAttributeNode("notnull").value =="1" ) ) {
					if ( formname.elements[i].title != null )
						alert(formname.elements[i].title);
					else			
						alert("Please input data!");
					formname.elements[i].focus();
					return false;				
				} 				
				if ( formname.elements[i].name.indexOf("Email") >= 0 || ( formname.elements[i].getAttributeNode("checkEmailFormat") != null && formname.elements[i].getAttributeNode("checkEmailFormat").value =="1" ) ) {
					if ( chk_Email(formname.elements[i]) == false ) {
						if ( formname.elements[i].getAttributeNode("ErrMsg") != null )
							alert(formname.elements[i].getAttributeNode("ErrMsg").value);				
						else						
							alert("Please check your email format!");		
						return false;
					}	
				}			
				break;
			case "SELECT":
				if ((formname.elements[i].getAttributeNode("notnull")) != null && (formname.elements[i].selectedIndex < parseInt(formname.elements[i].getAttributeNode("lowindex").value))) {
					if ( formname.elements[i].title != null )
						alert(formname.elements[i].title);
					else			
						alert("Please select one choice!");
					formname.elements[i].focus();
					return false;										
				}
				break;
			default:
				break;
				
		}
		
	}
	return true;
  } catch (e) {
  	alert(e);
  	return true;
  }
}

function chk_Num(obj,min) {
	if ( obj != null ) {
		if ( isNaN(obj.value) || obj.value == "" ) {
			if ( obj.title != null )
				alert(obj.title);
			else
				alert("Please input a number!");
			obj.focus();
			return;
		} else {
			if ( min != null ) {
				if ( parseInt(obj.value) < parseInt(min) ) {
					alert("Mininum requirement is: " + min);
					obj.value = min;
					obj.focus();
					return;
				}
			}				
		}
		
	}
}

function chk_Date(date1,date2) {	//3rd argument, max:range_day
	var nRange = 0;	
	if ( arguments.length == 3 )
		nRange = arguments[2] ;	//day

	if ( date1.value != "" && date2.value != "" ) {
		if ( date1.value > date2.value ) {
			if ( date1.title != "")
				alert(date1.title);
			else
				alert("Please select valid period!");
			date2.focus();
			return false;
		} else if ( nRange != 0 ) {
			var t1 = Date.parse(date1.value);
			var t2 = Date.parse(date2.value);
			var nDiff_D = Math.round( Math.abs((t2-t1)/(3600*1000*24) ) );			
			if ( nDiff_D  > nRange ) {
					alert(date1.title);
					date2.focus();
					return false;
			}
		}
		return true;
	}
}

function UrlEncode(str){
	/*********qiushuiwuhen(2002-9-16)********/
	var i,c,p,q,ret="",strSpecial="!\"#$%&'()*+,/:;<=>?@[\]^`{|}~%";
	for(i=0;i<str.length;i++){
			c=str.charAt(i);
			if(c==" ")
				ret+="+";
			else if(strSpecial.indexOf(c)!=-1)
				ret+="%"+str.charCodeAt(i).toString(16);
			else
				ret+=c;
	}
	return (ret);
}