var currentTab = 1;
var enableAlert = 0;

function myalert(string)
{
	if(enableAlert==1)
	{
		alert(string);
	}
}

function stripAlphaChars(pstrSource) 
{ 
	var m_strOut = new String(pstrSource); 
    m_strOut = m_strOut.replace(/[^0-9]/g, ''); 
    return m_strOut; 
}

function checkInput(type)
{
	if(type==1)
	{
		document.getElementById('sbp').value = stripAlphaChars(document.getElementById('sbp').value);
	}
	else
	{
		document.getElementById('dbp').value = stripAlphaChars(document.getElementById('dbp').value);
	}
}





function checkVariables(mysbp, mydbp)
{
	var errorType = 0;
	if(isNaN(mysbp)==false)
	{
		if(mysbp>200)
		{
			document.getElementById('sbp').value = 200;
			mysbp = 200;
			//myalert("SBP value cannot be greater than 200");
			//errorType =  1;
		}
		else if(mysbp<0)
		{
			document.getElementById('sbp').value = 0;
			mysbp = 0;
			//myalert("SBP value cannot be less than 0");
			//errorType =  1;
		}
	}
	else
	{
		mysbp = 0;
		document.getElementById('sbp').value = 0;
		myalert("Please enter a SBP value");
		errorType =  1;
	}

	if(isNaN(mydbp)==false)
	{		
		if(mydbp>200)
		{
			document.getElementById('dbp').value = 200;
			mydbp = 200;
			//myalert("DBP value cannot be greater than 200");
			//errorType =  1;
		}
		else if(mydbp<0)
		{
			mydbp = 0;
			document.getElementById('dbp').value = 0;
			//myalert("DBP value cannot be less than 0");
			//errorType =  1;
		}
	}
	else
	{
		mydbp = 0;
		document.getElementById('dbp').value = 0;
		myalert("Please enter a DBP value");
		errorType =  1;
	}
	
	if(mydbp>=mysbp)
	{	
		if(mysbp>4)
		{
			mydbp = mysbp-5;
			document.getElementById('dbp').value = mysbp-5;
		}
		else
		{
			mydbp = 0;
			document.getElementById('dbp').value = 0;
		}		
		//myalert("DBP value cannot be greater than SBP");
		//errorType =  2;
	}
	return errorType;
}


function blueGraph(blue)
{
	return Math.floor(blue);
}

function redGraph(red)
{
	return Math.floor(red);
}

function fillTable(counter, type)
{
	if(type==2)
	{
		document.getElementById("redimg1").height = counter;
	}
	else
	{
		document.getElementById("blueimg1").height = counter;
	}
}

function compute()
{

	var mysbp = parseInt(document.getElementById('sbp').value);
	var mydbp = parseInt(document.getElementById('dbp').value);
	var type = checkVariables(mysbp, mydbp);
	
	var mysbp = parseInt(document.getElementById('sbp').value);
	var mydbp = parseInt(document.getElementById('dbp').value);
	var bb = blueGraph(mydbp);
	var rr = redGraph(mysbp);
	fillTable(bb,1);
	fillTable(rr,2);
	selectImage();
}

function changeTab(id)
{
	currentTab = id;
	selectImage();
}

function selectImage()
{
	var mysbp = parseInt(document.getElementById('sbp').value);
	var mydbp = parseInt(document.getElementById('dbp').value);
	document.getElementById('jnc1').style.display = "none"; 
	document.getElementById('jnc2').style.display = "none"; 
	document.getElementById('jnc3').style.display = "none";
	document.getElementById('jnc4').style.display = "none";
	document.getElementById('esh1').style.display = "none";
	document.getElementById('esh2').style.display = "none";
	document.getElementById('esh3').style.display = "none";
	document.getElementById('esh4').style.display = "none";
	document.getElementById('esh5').style.display = "none";
	document.getElementById('esh6').style.display = "none";
	document.getElementById('esh7').style.display = "none";
	document.getElementById('who1').style.display = "none";
	document.getElementById('who2').style.display = "none";
	document.getElementById('who3').style.display = "none";
	document.getElementById('who4').style.display = "none";
	document.getElementById('who5').style.display = "none";
	document.getElementById('who6').style.display = "none";
	document.getElementById('who7').style.display = "none";
	document.getElementById('who8').style.display = "none";
	document.getElementById('who9').style.display = "none";
	if(currentTab==1)
	{
		if(mysbp>=160 || mydbp>=100)
		{
			document.getElementById('jnc4').style.display = "block";
			return;
		}
		if(mysbp>=140 && mydbp>=90 && mydbp<=99)
		{
			document.getElementById('jnc3').style.display = "block";
			return;
		}
		if(mysbp>=120 && mydbp>=80 && mydbp<=89)
		{
			document.getElementById('jnc2').style.display = "block";
			return;
		}
		if(mysbp<120 || mydbp<80)
		{
			document.getElementById('jnc1').style.display = "block";
			return;
		}
	}
	else if(currentTab==2)
	{
		if(mysbp>=180 || mydbp>=110)
		{
			document.getElementById('esh6').style.display = "block";
			return;
		}
		if(mysbp>=160 && mydbp>=100 && mydbp<=109)
		{
			document.getElementById('esh5').style.display = "block";
			return;
		}
		if(mysbp>=140 && mydbp>=90 && mydbp<=99)
		{
			document.getElementById('esh4').style.display = "block";
			return;
		}
		if(mysbp>=140 && mydbp<90)
		{
			document.getElementById('esh7').style.display = "block";
			return;
		}
		if(mysbp>=130 && mydbp>=85 && mydbp<=89)
		{
			document.getElementById('esh3').style.display = "block";
			return;
		}
		if(mysbp>=120 && mydbp>=80 && mydbp<=84)
		{
			document.getElementById('esh2').style.display = "block";
			return;
		}
		if(mysbp<120 || mydbp<80)
		{
			document.getElementById('esh1').style.display = "block";
			return;
		}
	}
	else if(currentTab==3)
	{
		if(mysbp>=180 || mydbp>=110)
		{
			document.getElementById('who7').style.display = "block";
			return;
		}
		if(mysbp>=160 && mydbp>=100 && mydbp<=109)
		{
			document.getElementById('who6').style.display = "block";
			return;
		}
		if(mysbp>=140 && mydbp>=95 && mydbp<=99)
		{
			document.getElementById('who4').style.display = "block";
			return;
		}
		if(mysbp>=140 && mydbp>=90 && mydbp<=94)
		{
			document.getElementById('who5').style.display = "block";
			return;
		}
		if(mysbp>=149 && mydbp<90)
		{
			document.getElementById('who8').style.display = "block";
			return;
		}
		if(mysbp>=140 && mysbp<=148 && mydbp<90)
		{
			document.getElementById('who9').style.display = "block";
			return;
		}
		if(mysbp>=130 && mydbp>=85)
		{
			document.getElementById('who3').style.display = "block";
			return;
		}
		if(mysbp>=120 && mydbp>=80 && mydbp<=84)
		{
			document.getElementById('who2').style.display = "block";
			return;
		}
		if(mysbp<120 || mydbp<80)
		{
			document.getElementById('who1').style.display = "block";
			return;
		}
	}
	return;
}