// JScript File
// RestrictLetters
    function extractNumber(obj, decimalPlaces, allowNegative)
    {
        var temp = obj.value;
        // avoid changing things if already formatted correctly
        var reg0Str = '[0-9]*';
        if (decimalPlaces > 0)
        {
		    reg0Str += '\\.?[0-9]{0,' + decimalPlaces + '}';
	    }
	    else
	        if (decimalPlaces < 0)
	        {
		        reg0Str += '\\.?[0-9]*';
	        }
        reg0Str = allowNegative ? '^-?' + reg0Str : '^' + reg0Str;
        reg0Str = reg0Str + '$';
        var reg0 = new RegExp(reg0Str);
        if (reg0.test(temp)) return true;

        // first replace all non numbers
        var reg1Str = '[^0-9' + (decimalPlaces != 0 ? '.' : '') + (allowNegative ? '-' : '') + ']';
        var reg1 = new RegExp(reg1Str, 'g');
        temp = temp.replace(reg1, '');

        if (allowNegative)
        {
            // replace extra negative
            var hasNegative = temp.length > 0 && temp.charAt(0) == '-';
		    var reg2 = /-/g;
		    temp = temp.replace(reg2, '');
		    if (hasNegative) temp = '-' + temp;
        }
	
        if (decimalPlaces != 0)
        {
            var reg3 = /\./g;
            var reg3Array = reg3.exec(temp);
		    if (reg3Array != null)
		    {
    			// keep only first occurrence of .
	    		//  and the number of places specified by decimalPlaces or the entire string if decimalPlaces < 0
		    	var reg3Right = temp.substring(reg3Array.index + reg3Array[0].length);
			    reg3Right = reg3Right.replace(reg3, '');
			    reg3Right = decimalPlaces > 0 ? reg3Right.substring(0, decimalPlaces) : reg3Right;
			    temp = temp.substring(0,reg3Array.index) + '.' + reg3Right;
		    }
	    }
        obj.value = temp;
    }
    
    function blockNonNumbers(obj, e, allowDecimal, allowNegative)
    {
    	var key;
	    var isCtrl = false;
    	var keychar;
	    var reg;
    	if(window.event) 
    	{
    		key = e.keyCode;
	    	isCtrl = window.event.ctrlKey
	    }
        else
            if(e.which)
            {
        		key = e.which;
		        isCtrl = e.ctrlKey;
	        }
	    if (isNaN(key)) return true;
	    keychar = String.fromCharCode(key);
	
        // check for backspace or delete, or if Ctrl was pressed
        if (key == 8 || isCtrl)
	    {
		    return true;
	    }

    	reg = /\d/;
	    var isFirstN = allowNegative ? keychar == '-' && obj.value.indexOf('-') == -1 : false;
	    var isFirstD = allowDecimal ? keychar == '.' && obj.value.indexOf('.') == -1 : false;
    	return isFirstN || isFirstD || reg.test(keychar);
    }