/**
 * email validation script. Courtesy of SmartWebby.com (http://www.smartwebby.com/dhtml/)
 */

function CheckEmail(str) {

	var at="@"
	var dot="."
	var lat=str.indexOf(at)
	var lstr=str.length
	var ldot=str.indexOf(dot)

	if (str.indexOf(at)==-1){
		alert("Invalid E-mail ID")
		return false
	}

	if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr){
		alert("Invalid E-mail ID")
		return false
	}

	if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr){
		alert("Invalid E-mail ID")
		return false
	}

	if (str.indexOf(at,(lat+1))!=-1){
		alert("Invalid E-mail ID")
		return false
	}

	if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot){
		alert("Invalid E-mail ID")
		return false
	}

	if (str.indexOf(dot,(lat+2))==-1){
		alert("Invalid E-mail ID")
		return false
	}
		
	if (str.indexOf(" ")!=-1){
		alert("Invalid E-mail ID")
		return false
	}

	 return true					
}


//currency validation
function isCurrency(f){
	var nNum = 0;			// Total numbers for currency value.
	var nDollarSign = 0;	// Total times a dollar sign occurs.
	var nDecimal = 0;		// Total times a decimal point occurs.
	var nCommas = 0;		// Total times a comma occurs.
	var txtLen;				// Length of string passed.
	var xTxt;				// Assigned object passed.
	var sDollarVal;			// Assigned dollar amount with or without commas.
	var bComma;				
	var decPos;				// Assigned value of numbers or positions after decimal point.
	var nNumCount = 0;		// Total number between commas.
	var i;					// For forloop indexing.
	var x;					// Assigned each indivual character in string.
	
	// Set the xTxt variable to the object passed to this function.
	// Assign the length of the string to txtLen.
	xTxt = f;
	txtLen = xTxt.value.length

	for(i = 0; i < txtLen; i++){
		// Assign charater in substring to x.
		x = xTxt.value.substr(i, 1);
		
		if(x == ".")
			nDecimal = nDecimal + 1; // Sum total times decimal point occurs.
		else if(x == ",")
			nCommas = nCommas + 1; // Sum total times comma occurs.
		else if(parseInt(x) >= 0 || parseInt(x) <= 9)
			nNum = nNum + 1; // If the character is a number sum total times a number occurs.
		else{
			// Error occurs if any other character value is in the string
			// othere then the valid characters.
			//alert("ERROR! \nYou have entered an illegal value!\nPlease enter only: Numbers Between 0...9, Commas, Decimal Points, and !");
			return false;
		} // end else
	} // end for

	if(nDecimal > 1){
		//alert("ERROR! \n\nYou have entered more then one decimal point!\nPlease only enter one!");
		return false;
	} // end if
		
	if(nDecimal == 1){
		// Get the number of numbers after the decimal point in
		// the string if there is a decimal point present
		decPos = (txtLen - 1) - xTxt.value.indexOf(".");
		
		// Floating point cannot be more then two.
		// Valid format after decimal point.
		/**********************************/
		/*   $#.##, $#.#, $.#, $#., $.##  */
		/**********************************/
		if(decPos > 2){
			//alert("ERROR! \n\nThe decimal point you entered is not in the correct position!");
			return false;
		} // end if
	} // end if
	
	if(nCommas == 0){
		// If no commas are present value is a valid US
		// currency.
		return true;
	}else{
		// Get total number of dollar number(s), removing
		// floating point numbers or cents.
		nNum = nNum - decPos;
		
		// Determine if dollar sign is in string so to be 
		// removed.
		// After determining dollar sign, assign sDollarVal
		// numbers and comma(s)
		if(xTxt.value.indexOf("$", 0) == 0)
			sDollarVal = xTxt.value.substr(1, (nNum + nCommas));
		else
			sDollarVal = xTxt.value.substr(0, (nNum + nCommas));
		
		
		// Determine if a zero is the first number or if a
		// comma is the first or last character in the string.
		if(sDollarVal.lastIndexOf("0", 0) == 0 ){
			//alert("ERROR! \n\nYou cannot start the Rs. amount out with a zero!");
			return false;
		}else if(sDollarVal.lastIndexOf(",", 0) == 0){
			//alert("ERROR! \n\nYou cannot start the Rs. amount out with a comma!");
			return false;
		}else if(sDollarVal.indexOf(",", (sDollarVal.length - 1)) == (sDollarVal.length - 1)){
			//alert("ERROR! \n\nYou cannot end the Rs. amount with a comma!");
			return false;
		}else{
			// Initialize bComma indicating a comma has not been
			// occured yet.
			bComma = false;

			for(i = 0; i < sDollarVal.length; i++){
				// Assign charater in substring to x.
				x = sDollarVal.substr(i, 1);

				if(parseInt(x) >= 0 || parseInt(x) <= 9){
					// If x is a number add one to the number counter.
					nNumCount = nNumCount + 1;

					// Sense comma(s) are present number counter cannot
					// be more then three before the first or next comma.
					if(nNumCount > 3){
						//alert("ERROR! \n\nYou have a mis-placed comma!");
						return false;
					} // end if
				}else{
					// If the number counter is less then three and
					// the comma indicator is true the comma is either
					// mis-placed or there are not enough values.
					if(nNumCount != 3 && bComma){
						//alert("ERROR! \n\nYou have a mis-placed comma!");
						return false;
					} // end if

					// Reset the number counter back to zero.
					nNumCount = 0;

					// Set the comma indicator to true indicating
					// that the first comma has been found and that
					// there now MUST be three numbers after each
					// comma until the loop hits the end.
					bComma = true;
				} // end if
			} // end for

			// Determine if after the loop ended that there
			// was a total of three final numbers after the
			// last comma.
			if(nNumCount != 3 && bComma){
				//alert("ERROR! \n\nYou have a mis-placed comma!");
				return false;
			} // end if
		} // end if
	} // end if

	// Return true indicating that the value is a valid
	// currency.
	return true;
}